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.
Love me, I win.
Hate me, I win.
Ignore me, I've got exactly what I wanted.
Love me or hate me, you're still thinking of me either way.