Just thinking about this wave and one figure I wouldn't mind seeing eventually in a ROTJ wave is a new Spirit of Yoda. Granted, there are a number of new characters and resculpted figures I'd like to see first, but after the new Spirit of Obi in the OTC Collection and the new Spirit of Anakin in the TAC line, I wouldn't mind seeing Yoda get a new treatment as well. I suppose this would be a good candidate for a repaint wave, but it doesn't sound like we're getting one of those next year.
I thought I remembered there being a rumor at one time that one of the UBPs this year was supposed to be a Funeral Pyre/End Celebration theme with all three spirit figures and the Pyre with Vader. I think the other rumored one was ANH/Death Star themed, so that rumor seemed to be way off (I think this was at RS, if I remember correctly).
Anyways, it might be a nice figure to include at some point. Although there are still new figures to include, there's a part of me that wants a number of resculpts from this movie now as well (Ackbar, Nunb, Prune Face, "ultimate" Endor soldier, ewoks, etc.)