I have read a lot of what people would like to see in KOTOR II, and they are great suggestions. But here are some things that I didn't see.
FIGHTING
The first game was amazing, but I think that the fighting system really needs to be improved. In KOTOR, you pushed a button and sat there waiting seconds for the other guy to die. You couldn't really control his fighting. 1) In KOTOR II, there should be a fighting button where you press it and he swings his/her blade or whatever weapon. And when you press it in succession, he can do combos; gets you more involved in combat and lets you make the decisions. 2) There should totally be a defend/block button so you aren't standing there getting hit and can't do anything about it (like in KOTOR).
FORCE POWERS AND USEABLE ITEMS
I liked all the force powers and the items that you could get. I do also agree with lots of other people that there should be new ones, but keep the old ones too. The game should thus be longer so you can maximaize the level for each one. But down to the real stuff. These two traits go hand-in-hand, in my opinion. 3) To make selecting each easier, the d-pad should be used; pushing the up/down button scrolls through foce and left/right scrolls through items ro vice versa.
PEOPLE
Make the faces of people look realistic. I mean, they practically looked stone faced with no emotion. And when you are talking to someone, their mouth should look like it is making the words, not just going up and down.
SWOOP BIKE
If there is more racing in the next game, make the bike you have upgradeable.
And anything else that would make the game get the Best Game of The Year Award.