I see a lot of "won't be used" or "can't beat most tanks in a fight" posts. I think people are VASTLY underestimating the benefit of not only a smaller sillouette, but of a smaller target profile.
1) You can hide in the bushes completly, greatly adding to 'camoflauge'
2) you have the firepower to knock out all but 1 tank (Tiger II) in the game from the front at ranges in excess of 1200yds.
And if time before addition is a big constraint in people's minds (I don't see why it would be, since people are asking for planes that would take longer to model graphicly than most tanks), we could always get a StuG IV. Basicly a StuG III superstructure mounted on a Panzer IV chassis, with improved ammunition capacity.