Bigger/Faster HD's, much better GPU, up to 4GB ram, CPU Bump (small, but I don't care), Higher res in the 17" and faster superdrive in the 15" and LED backlighting for all (or maybe just the 15").
I am glad to see it's just an slight incremental 'bump' upgrade. Now I dont have to come up with a reason to sell off my current 'old' C2D mbp to buy the latest model.
Hmm.. with that said, it is LED backlit, faster bus, updated graphics processor... Hmm.. no. Maybe next time.