The only german tanks that I can think that can be included is King Tiger, Jagdpanzar, and Panther 
somebody needs to read on ground warfare of WWII
Panther, King Tiger, Stug IV, Stug III, Pnzr III, Jagdpanzer, Hetzer, MardarIII, Jagdpanther, Jagdtiger, many halftrack gun carridges, and include the Hummel SP artillery gun here too.
In the Allies department, we have the M3 Stuart, M3 Lee/Grant, M18 Hellcat, M10 tank destroyer, M12 heavy GMC, M3 GMCs, Churchill crappy IST, Cromwell not so crappy cruiser tank, Crusader cruiser tank, M7 Priest SP 105 artie piece.
I would include the M4A3 but these are already being created
Wanna go Russian? KV-1, KV-2, Su-85 and there's others i can't remember at this time
There is much missing from the GV set Thrash just look around sir
