According to TechCrunch sources, the iOS 5 update will come complete with a revamped notifications system and widgets of some form. I would normally explain more here, but that's all they said. [TechCrunch]
How about a universal file system? App developers have largely addressed this gap, but the UI and capabilities in each app can be very different and this really messes up the otherwise amazing uniformity of the UI across all functions. For example, do some file management in GoodReader and then compare to Dropbox. You'll get a headache. I'd like to see Apple tie this all together in their normal amazing fashion.