I personally would like to see 2 more movies made for the Jedi Knight storyline. That would be really cool to see a full length movie made that follows Kyle, Jan, Jerec and the Dark Jedi's.
I'd also like to see a movie based on the book "Darksaber". I thought that was one of the best books to date. Wouldn't mind seeing a movie to "Shadows Of The Empire" as well, but because that took place between Empire and ROTJ, and since the actors are now getting pretty old, I doubt that will ever happen.