I'd like some more 12" aliens. At the top of my list (in random order):

Hammerhead
Squidhead
Zutton
Ellorrs Madak
Gamorrean
Nien Nunb
Djas Puhr


Maybe some prequel aliens, too?

Kaminoan
Po Nudo (or other Aqualish senator)


I hate to request resculpts, but my alien collection sure is hurting without Greedo. It'd be nice if there was a 12" Greedo that looked as good compared to the first one as COMMTech Greedo does to the first POTFII Greedo.