I'd be interested to see an iOS developer's perspective on when they're going to start requiring iOS 6. From a user's perspective, I don't see any features that

I'd be interested to see an iOS developer's perspective on when they're going to start requiring iOS 6. From a user's perspective, I don't see any features that are going to encourage devs to drop iOS 6 compatibility (eg. ARC; background support). It's big these types of features and functionality that are going to determine the usefulness and longetivity of iOS 5.