Do you listen to opportunity when it comes knocking? If you're an iOS developer, the time might be now, according to this article by Marco Arment:
Apple has set fire to iOS. Everything's in flux. Those with the least to lose have the most to gain, because this fall, hundreds of millions of people will start demanding apps for a platform with thousands of old, stale players and not many new, nimble alternatives. If you want to enter a category that's crowded on iOS 6, and you're one of the few that exclusively targets iOS 7, your app can look better, work better, and be faster and cheaper to develop than most competing apps.
Whatever your reaction may be to whether this is good for consumers, this is certainly an opportunity worth noting if you're in this game.