I think Force combos is a pretty good idea. But it would be prety lame to see something like grip+lightning+destruction all at once.
I'm hoping for a good balance in JK2. I don't care if we have 30 powers or 5, as long as there is balance. JK did an excellent job at making both light side and dark side powers beneficial to their user. And good counters for every force power in the game.