I do think developers will show good stuff this year. The Wii has started proving it CAN be a viable market for good, more mature 3rd party games. The Nintendo competition is somewhat less strong (Last year saw the big 3 Mario, Metroid, Zelda). SSBB and MK are enormous of course but less of a thread to single player games.
Furthermore the install base is growing and growing and the devs, one or two excluded,will start to show more high quality games that they started on last year when the Wii performed way better then expected.
Edit:
Stuff I'd like to see:
A good racer, WRPG, Good hack and slash, Fatal Frame 4 (oh hey, that's coming), RESIDENT EVIL!!!, Beyond Good & Evil 2







