More lightsaber combat things as well as powers. Left handedness.
Customizable character body and apparel (smackdown to MK/Soul Caliber)
More hand to hand. More melee.
Elaborate on the past 2 a little while somehow drawing the series to a clean playthrough.
A Dignified conclusion to the series as well as having a story all its own.
"I cant see S***! --YOU GO TO HELL!" --Tourettes guy