Well here's a list of all the known games that'll be appearing at E3. There's still more than a month left so, more will be added.
2K Games
Charlie and the Chocolate Factory (Cube, GBA, PC, PS2, Xbox)
NBA 2K6 (PS2, Xbox)
NHL 2K6 (PS2, Xbox)
Top Spin (PS2)
World Poker Tour (Unspecified...