Conker's Bad Fur Day - Huge 3D open world platformer / action adventure. Show off next gen physics and scale.
Viva Pinata - Again, huge open world, hybrid safari/Pokemon collect em all type game.
Kameo - Are you seeing a pattern here? :P Huge open world! Dungeons! Magic! Orcs! Basically a next gen open world fantasy Zelda type game.
They won't do any of those though.