Another point and click adventure would be great but those seem to be a dying trend (unfortunately). However, I really like the adventure/action feel of Emperor's Tomb and I would love to see another game like that, although they could add more of the elements in the poll. Allow Indy to roam more freely, upgrade and buy new gear and equipment, talk and interact with people, add more puzzles, etc. Anything's possible and I'm anxious to hear what LucasArts plans to do with the next Indy game.
And by the way, thanks Aaron H for making all these new threads. You're certainly breathing new life into some of these topics.