Something I thought of recently while going through the shelves is a Lars Homestead UBP. It might not be the most exciting thing, but it might be a good way to put that nice SAGA Landspeeder out there again, a handful of moisture vaporators from the TAC Luke figure, and maybe one of the "huts" that sits above ground at the homestead would be cool. It would be a good opportunity to get resculpted Owen Lars and Beru (although that would make people understandably mad if they were in a pricey Battle Pack), and maybe a re-release of figures like the VOTC Luke, a R2-D2 (using a R4-G9 repaint), and a weathered version of the Endor throne 3PO. You could probably toss in some other miscellaneous droids, or if you wanted to extend it, maybe even Obi-Wan, Jawas, or Tusken Raiders. Now that I think of it though, it really isn't "action oriented" enough, and probably wouldn't be a big seller. It would be neat to see the Landspeeder out there again, and be able to get more of the vaporators or other Lars homestead scenery.
A more action-oriented idea might be something revolving around the Sarlacc Pit. This might be the only way we could get a Sarlacc, even if it was a plastic/cardboard combo piece as the bottom of the box. You could also put the POTF2 Skiff (or two) in there, and pack it full of skiff guards, Han, Luke, Lando, Chewie, and everyone else in that scene.