Peter Hajas, the lead developer of the popular jailbreak notifications replacement, MobileNotifier, is now an Apple "iOS Apps and Frameworks" employee. We originally speculated that Hajas was working for Apple when he announced that he was leaving as the head of the MobileNotifier development team, and it has now been confirmed that Apple has hired Peter Hajas to work on iOS.
iOS 5 will be unveiled at WWDC on Monday, and Apple could introduce a new system of push notifications. It's unlikely that any of Peter's work will be seen in iOS 5. He is most likely working on a future update to Apple's mobile software...