I think this set is a bit tougher than the others, because there weren't that many main characters or drastically different outfits/incarnations of characters from ANH that we didn't already get. The ceremonial garb is one possibility, but they only appeared for about a minute, and those aren't particularly interesting or different, IMO.
I say one or two more "bar" aliens/monsters, possibly another new empire goon, maybe an update of "classic" Leia and Luke, though I would hope that they would have enough to set them apart from their "Early Bird" releases. "Old Ben" with hood up could be a nice variant to own, though kind of dull.