No details available about OT I am afraid.
Force powers are in flux but talking of the special Dark Side ones- a definitive difference is now being drawn between Foresight and manifest Destinyy.
Foresight will help you win the game. On the Light Side this will almost certainly be a power to help the team, on the Dark Side it will likely show how YOU can win, but as that makes it a won game it does, broadly, benefit you all.
Manifest Destinty will now reveal something you can do, in game, to increase your own power, irrelevant to the plot. if you meet the requirements of Manifest Destiny that it shows to you... you will gain bonus xp.