HomePod private beta could be testing voice calls, multiple timers
The HomePod could enable users to place phone calls through the smart speaker, a report on a private beta for HomePod OS 12 claims, with the array of incoming new features for the audio device including the ability to use it as a speakerphone for a wirelessly-connected iPhone.

Once connected to an iPhone, the HomePod will allow users to make outbound calls and answer inbound communications, redial numbers, search the call log, perform emergency calls, and to listen to the user's voicemail, reports iGeneration. It is unclear if the same system will allow for audio FaceTime calls, nor if it will allow for calls to route through a local Wi-Fi network instead of cellular.
The ability to make and receive calls is similar to features already available on the HomePod's main competitors. Amazon's Echo range and the Alexa app allow for calls to be placed to other Echo devices owned by contacts, while Google Home is capable of making hands-free calls for users, without requiring a smartphone for the connection.
Another useful feature for iPhone owners will be the ability to use "Find My iPhone" through the HomePod, asking the speaker to locate the smartphone instead of accessing a computer or another iOS device.

via iGeneration.
For those who regularly need to switch the Wi-Fi network the HomePod is connected to, a "fix Wi-Fi" function will allow users to make the HomePod connect to the same local connection as their iPhone. In theory, this would make the network switch without needing to reset the HomePod, a maneuver that's currently needed to accomplish the same task.
Lastly, the HomePod will enable users to set multiple timers. A complaint heard in multiple reviews of the device, users will be able to start and manage more than one timer, making it more useful in cookery and other situations where many things have to be timed separately.
While these features are supposedly available in the private beta, it is possible Apple could hold back one or more of the functions from public release. It is anticipated that Apple will ship an update for the HomePod containing one or more new features this fall, to coincide with the release of macOS 10.14 Mojave, iOS 12, tvOS 12, and watchOS 5.

Once connected to an iPhone, the HomePod will allow users to make outbound calls and answer inbound communications, redial numbers, search the call log, perform emergency calls, and to listen to the user's voicemail, reports iGeneration. It is unclear if the same system will allow for audio FaceTime calls, nor if it will allow for calls to route through a local Wi-Fi network instead of cellular.
The ability to make and receive calls is similar to features already available on the HomePod's main competitors. Amazon's Echo range and the Alexa app allow for calls to be placed to other Echo devices owned by contacts, while Google Home is capable of making hands-free calls for users, without requiring a smartphone for the connection.
Another useful feature for iPhone owners will be the ability to use "Find My iPhone" through the HomePod, asking the speaker to locate the smartphone instead of accessing a computer or another iOS device.

via iGeneration.
For those who regularly need to switch the Wi-Fi network the HomePod is connected to, a "fix Wi-Fi" function will allow users to make the HomePod connect to the same local connection as their iPhone. In theory, this would make the network switch without needing to reset the HomePod, a maneuver that's currently needed to accomplish the same task.
Lastly, the HomePod will enable users to set multiple timers. A complaint heard in multiple reviews of the device, users will be able to start and manage more than one timer, making it more useful in cookery and other situations where many things have to be timed separately.
While these features are supposedly available in the private beta, it is possible Apple could hold back one or more of the functions from public release. It is anticipated that Apple will ship an update for the HomePod containing one or more new features this fall, to coincide with the release of macOS 10.14 Mojave, iOS 12, tvOS 12, and watchOS 5.

Comments
I assume that multiple users are coming, but that's considerable harder to code and get right than multiple timers.
Apple is doing exactly what I said they were doing. They made sure the hardware was really good and worked really well and just released it with basic features to get it out the door. Apple can always fix software and add features after they ship, but it's nearly impossible to change shitty hardware once its been shipped.
Maybe they could authenticate with a device at first until Apple gets voice working better? You know what's gonna happen....Apple would release it and everyone would try (and probably succeed to some extent) to fool it and then say how shitty of an implementation it is, just like with FaceTime, TouchID, etc.
All of these additions people would like to see will come in time. iPhone didn't have every single feature right off, Apple Watch didn't, iPod didn't, iPad didn't, etc. It takes time to get these features implemented, tested and out the door. Some just don't get it.
Multi-User support I think is the biggest needed feature. How about that? Remember though, the HomePod has been out a lot less than Google Home let alone Amazon Echo's. It's not going to happen over night. On the other hand, it should happen faster than it is. It's not a cheap device and so should have support for many of these things already.
I do have to say that the Mics on it really pick up my voice so good. I can be on the other side of my Bedroom with the HomePod on the other side of the room cranked up playing music, and I can almost wispier a Hey Siri and it hears me. Doing the same with my Amazon Dot and Google Mini, I pretty much have to Yell to get it to respond. So I can be in the Master Bathroom and speak normally to have the HomePod so what I want.
I'm always for more capabilities.
1. When using the HomePod as an AirPlay speaker, not all apps use it as an audio output even when the HomePod is set to the audio output device in the settings.
2. Every time the Apple TV goes to sleep, it disconnects from the HomePod and defaults the audio output back to the TV.
3. After playing audio to the HomePod using the Apple TV, the HomePod will no longer fulfill requests such as "Hey Siri, play smooth jazz". Instead, Siri says, "Hmm. I'm having trouble..." However, if I play then stop music from my iPhone, the HomePod will work properly.
I've stopped using the HomePod as an Apple TV speaker because of these issues and reverted back to my Bose SoundLink via a Bluetooth connection. The connection is maintained and all the Apple TV's audio is output properly.
The main issue I’ve experienced has been some occasional difficulty in using the ATV’s controls to uncouple ATV from a HomePod in AirPlay 2 when the couping was originally initiated via the HomePod. That may or may not have already been resolved with the last round of OS patches.
Also, perhaps the real issue with #3 is that “smooth jazz” is an abomination, and Siri may just be coyly trying to keep you from making the mistake of playing that stuff.
1. This is annoying. Most big apps works fine (Netflix, etc) but some third party apps don’t work right. I’m guessing the developer isn’t checking some box, but Apple should just make it force it.
2. I don’t have this issue. The AppleTV and HomePod stay connected until I use my HomePod for something else. Which happens a lot, so I do have to reconnect a lot. It’s pretty simple but could be easier. Wish I could just use Siri to change audio output.
3. When I have my AppleTV and HomePod “paired”, and I say “Play...” it will play it through the AppleTV, routed to the HomePod (kinda backwards imo). If my AppleTV is off, it turns on my TV, since it is plugged into the HDMI-CEC connection. Maybe yours isn’t?
All that said, what I’ve read is that the latest beta allows you to more permanently set the HomePod as the default audio, but it will still have to be selected if you use your HomePod for something else.
Imo, it should be an easy fix. Instead of permanently pairing an AppleTV and HomePod, you should be able to tell the AppleTV to “look for” and connect to the specified homepod when you play content. If it can’t connect, it should have a dialog message. It would replace whatever is currently playing, just like airplay does currently.
Worthless and shitty really can't be interchanged. Yes, I'm being an ass here, but in its current state, the HomePod is a worthless product *to me* simply because I don't value it for the price for what it delivers. Maybe in the future that will change. It might become a better device (and cost less); it might be my needs and tastes change. Right now, others may value it.
That's different than shitty. Shitty implies to me that it is incomprehensible how any can value the product. I've run across a lot of shitty products, and HomePod doesn't seem shitty. Samesung and Microsoft stuff seems shitty to me. But to people that value that shit, it might not be shitty. Siri seems shitty to me, but I did't really pay for Siri, so it is hard to say it is worthless. I would say Siri is worth what I paid for it.
On a related topic I am toying with buying the Roku speakers. I have a lot of legacy audio gear that could use some help, but it is hard to say the $150-$200 price is a value. My current audio system works, but perhaps not elegantly. It isn't shitty, just inelegant. I'm not sure the Roku speakers are worthless.