Pablo confirmed on the OS last night that the Gunship is seen again in use during Ep3, so I'm assuming the AT-TE will be, too. The thing is cool and recognizable enough as a "Star Wars" vehicle probably more than any other PT design, simply because of its obvious design inspiration. With that in mind I'd bet they'd move at a respectable volume even if they didn't show in the movie, which is unlikely. Everyone loves big tank things that can squish things beneath them.
How much was the AT-AT when it was rereleased? I can't even remember. $80? Those sold for a while and then leveled out, and finally clearanced at $20. That's not encouraging. I'd figure these days the ceiling is 54.99 for vehicles, unfortunately. The Falcon hasn't been out for years, and the new OTC one is pretty well improved, but it's dormant on the shelves around here. The realist in me thinks the AT-TE is a hard sell from that perpective. There's a big audience for it, for the reasons said above, but probably not an audience flush with the cash for a proper one.
That said, I'd kick out whatever cash was required for a vehicle as cool as this done right. Big enough to house drivers, have a companion dropship, and some cargo space for speederbikes, and I'd fork over $80 again, no problem.