Xcode for the iPad: This is more of a wet dream, but Apple is building on the iOS as their main operating system for the future, and to get the real hardcore users to move to it, they have to make an IDE available. The main reason I gave up on my iPad and gave it to my mom was the lack of a good IDE (plus she really liked it :-).
This one makes me a little ill. Who would ever choose to develop in a crippled OS on underpowered hardware with no keyboard?! Argh it's like sometimes I feel there are two groups of software developers and I'm in the increasingly shrinking sane one. Fortunately, everything from Apple indicates the exact opposite about OS X and that OS X is more likely to become a developer-only environment than iOS to become any kind of development environment.