In keeping with the ESB 30th Anniversary, I'd love to see a FULL 3 3/4 scale playset of the Carbon Freezing Chamber (complete with carbonite freezing block, that you could freeze / thaw your own Han Solo figures)
A "Modular" Hoth Rebel Base playset (complete with blast doors and command center), that you could build and design the layout how you see fit (similar to the POTF2 DeathStar playsets of 1997).
As for vehicles...I still like to see a new Landspeeder released. It's been 8 years since we last saw that vehicle in the wild with the Saga packaging. I passed on it then not knowing that I want it now!