Dieter Bohn writing on PreCentral:

The man who “Invented the non-intrusive banner notification system used in webOS” and also did all sorts of other work for the OS, Rich Dellinger, is leaving Palm to return to his earlier employer, Apple, as a Senior User Interface Designer.

There’s no way of knowing whether or not he’ll be working on a new notification system for iOS. But, I think we all hope he does.