Originally Posted by MacBook Pro
"Where great ideas go on to do great things" is clearly a reference to the Apple "Do Engine," Siri.
Bingo - full marks for guessing it right. Everyone else, complaining about a bad tagline, etc, just wait till the event is over, and then you can have your two minutes to eat your words.
I expect the following announcements related to Siri - firstly, Apple will launch a couple of big partnerships that are entirely based on Siri - I mean, Apple's end of the bargain will be Siri, while the partner brings everything else. One of these partnerships is going to be in travel reservations - and expect one of Apple's big guns to talk to his phone saying "Siri, book me and my wife on a flight to Hawaii as soon as this conference is over" - and Siri will know what conference it is, when it is over, by looking at your calendar, know what flight to book you on based on your frequent flyer history, know how to bill you using your Apple account, and of course know your's and your wife's names and travel preferences.
The second major announcement is going to be about Maps, and integrating Siri with Maps. While Maps by itself is going to be a major improvement over what is currently offered in iOS, Siri integration will make it awesome. The other features of Maps might not yet be at a level where one would consider it better than Google's offering in Android - but Siri might just be the factor that tips the scales in favor of Apple. Turn by turn navigation will be much better when you don't have to fiddle with your phone while driving, and can set it going by just talking to it.
The most important announcement (for the developers), would be related to a new Siri API - how you can interface your Apps to Siri. There was a time when Google came up with an idea to make billions out of ordinary English words. Now it is Apple's turn to make billions selling words to App developers - how much would you pay, to direct queries for "movies" to your App? Or queries for "restaurants"? This is gold for App developers, and also for Apple.