What I'd be interested in would be an old style RPG, like those that got me into RPGs back in the day. From the style of Fallout, Planescape: Torment, and Arcanum. Not necessarily isometric view or anything, but the real focus is story and narrative and characters more than action and battle.
As for the game itself, I'd love it if you could revisit the world of Arcanum. Not Arcanum 2, as in a sequel to the story, but adventures in that setting and world. You really don't need to save much of the original's story, or setup. If not Arcanum, similar. It was a wonderfully inventive setting, and I'd love to see it again.
Barring actually being Arcanum, I'd love something in the spirit of it. That combination of Steampunk and High Fantasy, and the transition of one to the other. Heck, that might even be better.