I got the Tank Droid today (it's shipping alongside Ahsoka's Jedi Starfighter, though I didn't see that one). It's awesome! It might be a little smaller than it should be, but it's still quite large and hefty. The tread in the middle indeed works and it looks really cool. There's a forward-facing seat as well as a backward-facing one. My Kashyyyk diorama is about to get a lot more crowded.