I believe all areas of iOS will get a makeover. I believe they will completely redo the contacts and message app with more Facebook integration. Facebook is poorly integrated today in these apps. It would be great if Facebook messages were integrated with iMessage.
I believe that Apple has hold back big changes to iOS because they want these updates to run on as many devices as possible. Next year iPhone 4S is the third year device inline with Apple traditions to update the devices from three years back.