People only ask for vehicles every week or so. I mean, it's on the second page of the General Discussion forum.
Fine though, I'll bite. The next set of tanks were always going to be the T-70 and Pz. IIIJ, although my next suggestion would be the StuG III (F I guess) and a KV-1 for the Russians, to make it asymmetrical. An Su-76 would be cool but I think it would be too vulnerable given the open top to make it easy enough to implement, although if the map were open enough I guess it wouldn't really be a problem. I've always wanted to play a map like Bridges of Druzhina if the supporting armor had no turret.
The King Tiger should only make it if they make maps set a long time after Stalingrad.