Somehow Ace at FBTB.net slipped this by me yesterday (and by 'slipped by' I mean showed it in plain sight for all to see), but they are reporting on the minifigs fans requested for future LEGO Star Wars sets. You can check out the top 25 selections here. A lot of good stuff across the original trilogy, pre-quals, Clone Wars, and expanded universe. My favorite? Grand Admiral Thrawn (he just barely made the top ten).
A few of these selections I think you are almost guaranteed to see it future sets, like Quinlan Vos (he was mysteriously dropped from the T6 Jedi Shuttle) and Oola (come on LEGO has to use that Twi'lek head piece for other sets). Padme/Amadala and the Max Rebo band were pretty popular as well.
I believe these were requested with the intention of sharing with TLG, but only time will tell who will make an future appearance.
Hey, LEGO! There's nothing that says a Star Wars series of Collectible Minifigures isn't a possibility too...