I have an iPad (4th gen) and overall I am very happy with it. I have never once thought I needed that hands free option with gestures but I suppose it could be useful to some people on rare occasions. User profiles is also not a feature I really need since I use my iPad 98% of the time but for those rare occasions where I let someone use it I would be more comfortable if I could let them use a guest user account so they would not have full access to my email, Facebook, settings, and any other sensitive data. An iPad or iPhone after all have a lot of info on there that is very private that you may not want to share with others. But again this is not a major feature I have been clamoring for though I could see it as being very useful for many.
If I had to choose among features I really want to see on the next iPad or iOS the top of the list for me would be to continue to improve upon Siri. I use Siri a lot and it is still a little bit hit or miss especially on the iPad. Maybe my iPhone has a better microphone but it does seem to do a better job with voice recognition than my iPad. I hope Apple will keep improving Siri and will eventually allow some commands to be local and not require internet access to speed things up. Asking it to set a timer for 30 minutes for example should not require internet and can be frustrating if the server is busy and requires you to say it 4 times before it takes. Some voice training to improve accuracy would also be nice.
Other than an improved Siri I have no real complaints about my iPad. I suppose running 2 apps at once could come in handy but not a feature I would use a great deal. I do think Apple should allow for than 5x6 app grid instead of the current 4x5 which seems to waste a lot of space. It also seems they could easily fit 5 or even 6 apps in the dock. Having some OS X finder like power would also be nice if we could sort apps alphabetically for example, or by date installed, or by categories. The folders are a poor substitute but I would like to be able to quickly access only social networking apps, or games, or any other category and see only those apps. If you have over 300 apps like me installed the current system is pretty unwieldy.
But none of my minor quibbles make me want to consider a Windows or Android tablet. I trust Apple to continue to slowly improve both the hardware and iOS and still think it is a far superior tablet experience than the competition.