okay sorry i forgot the Modified T34 turret and the IS 2 .... but any way they dont havethat much stuff they need more :)
The Ruskies definatly need a Su-85, Su-122, and KV-1. And while they're at it they could use a Kv-2 and some more aircraft. With the Exception of the Panzer III the germans are pretty good vehicle wise!
(except for the lack of an Elefant)
Oh and forgot about the Jagdtiger: even though the front superstructure had 250mm of armor, the upper and lower front hull only had 150 and 100mm of armor, so you could just fine punch through there and kill the bugger. Assuming you manage to hit it there
150mm @ 50° ~ 233mm - same as KT front hull ;)
I wouldn't have anything against a Jagdpanther or Jagdtiger, but other vehicles like ISU-122, ISU-122S, ISU-152, SU-76, SU-85, SU-100, SU-122, SU-152, T-26, T-28, T-40, T-50, T-60, T-70, KV-1, KV-1S, KV-2, KV-85, BT-2, BT-5 etc (You get the point? If not, it's that FH has a serious lack of Soviet AFVs), and of course AFVs from other countries as well, should be done before them. I doubt that the devs can do all of those in a near future without feeling bored, but if they feel bored of doing only useful stuff, then they could pick a few vehicles from that list and do them and then do a Jagdpanther.