What I would like to see (and I'm sure a lot of people will disagree with me because it involves resculpts) would be a set of the entire Jedi Council, all with chairs and all with the correct articulation so they can sit down. But also have enough articulation to put in any other pose you want, when they're not sitting.
If Hasbro could do this, collectors would finally get the other remaining Jedi from the council, and the others that we do have could finally sit down.
I just always thought this set (or a couple of smaller sets) would be really cool...