Yeah, I'm curious if we'll see any of the "big" ones re-released over the next several years with the 3D releases. The AT-TE would be a good candidate with the "big" AOTC/ROTS offerings a little bit slimmer. I could see the Falcon making another appearance before all is said and done too, and like CHEWIE mentioned, a vintage packaged exclusive sounds like something they would do (although if it was up to $200 now I wonder how many would buy it). I could definitely see it coming out during one of the OT runs. Although it doesn't technically qualify as one of the "big ones", I think that Slave I is going to get the ESB treatment sometime in the next few years too (maybe for ESB's release). They could even make it a "big" vehicle for that year if they added in a few things (Boba Fett, Carbonite Han, etc.)
I do kind of like the idea that we have (at least) one big vehicle from each movie in the Saga. So far, we'll have the MTT for Phantom Menace, the AT-TE for Attack of the Clones, the Turbo Tank for Sith, the Falcon for A New Hope, the AT-AT for Empire, and that leaves Jedi (Sail Barge?).