Leia Endor (which would lend itself to Endor Luke down the road?)
Death Squad Commander
There's your six for the next series. Really, they should do the Jawa, but won't because of perceived complaints regarding the size, should it not be a two pack.
Based on Matt's post back on December 11th, I think it's reasonable to expect them to do all the vintage versions of:
main army builders: Stormtrooper, Biker Scout, Tusken Raider, Tie Pilot, Snowtrooper
So we're looking at 1-2 more Luke's; 1 more Leia; 1 more Han. Zuckuss, 4-LOM, IG-88, Bossk and Dengar. I think the snowtrooper (Hoth stormtrooper if you prefer) and the Tie Pilot are probable but I'm less convinced about the Death Squad Commander and AT-AT Driver being done. I do think they'll do Jawas and will throw in a chase figure with the vinyl cape version. Beyond that I can't think of too much more, unless they start drifting into Skiff Guards and Jabba's denizens but I think those fit into the third tier characters
more so than anything else.