My wish list for 40k would be:-
1. A new Chaos Space Marine codex with specific legion rules.
2. A new Buggy/Wartrack plastic kit for Orks. (Maybe if this new Specialist Games thing gets going they will release a new box set of Gorkamorka full of them.)
3. For me to paint up a whole army without getting side-tracked, selling stuff on e-bay, starting again and repeating in some sort of mad never-ending hobby loop.