I'd really like to see more playsets from A New Hope, ISB & ROTJ.
I like the Cloud City idea thats already been posted but what about a new Death Star complete with all the old accesories updated of course. Make it BIG LOL I mean really big! LOL I'd also like to see an updated version of of the Star Destroyer....the one with Vaders chamber (personally my fav as a child).
I'd love to see Hasbro make a Sandcrawler too and more of the characters from the cantina as well!