I do agree with some of the changes that this concept makes, as quite frankly, some of the things that have been done in iOS 5 feel quite...un-Apple-like, for want of a better word.
The way that Apple have done the notification area never felt right to me, always felt grafted on. The current multitasking bar lifts the current display content up, so why doesn't NC push it down?
The other one is the multitasking bar itself. The way that Apple implemented it was always stupid; you have a whole 3.5" of display to play with, so why restrict application switching to a single row?
There are parts of the concept that I disagree with, however.
Firstly is the app updates/flipcons idea. You can see the latest content, however this is of little use as you can't really do anything besides that (for example, news articles). Much like widgets in Android, after using them I've learnt that they are nowhere near as useful as people like to claim that they are. If you wanted updates on Facebook notifications, you could simply open the app! The issue with the flipcons idea is that you would require constant updates of the app's content; for example, Facebook would require push of not just the user's notifications, but everything, which of course would not have a great effect on battery life if say, pictures, were constantly downloaded. News applications could benefit, but again, an app with a well designed interface that makes it easy to see the latest articles would be just as useful here.
The Mission Control screen, in my opinion, should do away with application previews altogether; when using such a feature you are usually looking for the application you are going to be working with, rather than anything else. A preview isn't really necessary, as it wouldn't really be able to show enough useful detail, and you wouldn't need the information provided in a preview - if you did, as above you'd simply open the app. Live application previews wouldn't work well for the same reason - there simply isn't enough detail, and push/persistent running would be required.