EDIT: Speaking of the placement in the mod, that is. I don't think much major design will be changed with soviets. Stat wise, I have a couple things I'd like to change on the IS3.
But honestly I think the IS-3 just needs a slight nerf and that's really it.
The IS-3 nerfs look good. The problem with the IS-3 before was that shrecks were not a threat at all. The IS-3 gun could rip apart Grens and PGs while their shrecks would do minimal damage to it. If I had one more suggestion, I would suggest the Wehrmacht Panthers get a slight buff versus the IS-3 too. At the moment they have a very hard time penetrating the IS-3 for what they cost (600 manpower 110 fuel). The IS-3's resilience to the Panther gun could then be buffed back to its current state with each level of vet.I would not like to have the IS-2 replaced with the IS-3 because I think Soviets need buildable IS-2s to deal with Panthers. They had a lot of IS-2s historically anyways, so it makes no sense they should be limited to 1. However, I wouldn't mind if a "IS-2 Ace" replaced the IS-3 for historical accuracy (stats could be the same), as I suggested a long time ago when the IS-3 first came out.
PE and Wehr panther use the same corsix entry. They are the same tank. We would have to create a own Panther for PE.My idea was to make the IS2 a multible call in just like a hetzer.