Any posts will of course have to assume many things since we know so little, but it's about time for at least one hopefully constructive thread. I.E. not full of speculations but rather some prefaced assumptions and then hopefully good constructive suggestions and wishes.
First, I'll assume it's an RPG with a KoTOR style interface. D20 ruleset. Might as well also use KOTOR as a base for comparison.
Character Development:
This could be improved greatly from the first KoTOR. A few more "classes" or subsets with much more distinction between each one.
Combat:
This is an area which really needs improvement over KoTOR.
More feats that need activation and more magic/force power would make it more interactive rather than loading up a set of tasks and watching the cinematic as Sammael put it. Animation was good in KOTOR though, no complaints there. Also maybe tone down the greatness of the lightsaber and give many more options for ranged weapons, and all types for that matter. This could also come under character development as in KOTOR it was often necessary to use a lightsaber.
Subquests and their activation:
Several more would be much appreciated, and some more which perhaps need certain requirements to be activated. That's really all I have to say on that.
Alignment: It was done alright in KOTOR, especially considering the very black and white SW universe. some more in betweeny choices, particularily in dialogue, would be much appreciated.
Note: These suggestions hold no matter what game is in the making, KOTOR is only being used as a base of comparison.