This is not going to focus on infantry equipment so I will skim over them (and yes I know this is an infantry focussed game but I love the tank combat so…) but will instead focus on what vehicles could be added to the final few levels (assuming there will be a max of 40).
For Soviets:
Level 36 - Russian RPD LMG. (It’s even in the picture when spending your weapon orders).
Level 37 - Tanker 3 Class: ISU 122 (Or 152)
Although I feel the 152 would be more unique, for balance reasons I would go for the ISU 122 due to it having better anti-tank ability.
I feel it should be here since there’s nothing else like it in the game (right now) and it saw extensive use as a building clearer in Berlin, making it an obvious pick.
Level 38 - A non-premium version of the AS-44 (and without bipod). Although I know this is basically a paper gun but I’m not well versed in Soviet guns so I apologise. (If you can think of anything better then tell me)
Level 39 - Bomber 2 Class: Lend-lease M9A1 Bazooka. (Since 3000 were sent to the soviets if I remember correctly)
Level 40 - IS2 (1944) (for Tanker 3 Class)
This is very likely coming anyway due to its wreckage being found on Berlin, but would still be an absolute monster final soviet tank to have with that additional armour.
For Germany:
Level 36 - MG42 Belt feed (100 bullets). I feel this would basically be an upgraded m34 extended mag that we already have and would counter the RPD’s big mag size.
Level 37 - Tanker 3 Class: The Elephant.
The Elephant tank destroyer was used extensively on the eastern front, and although many were destroyed at Kursk, a fair few did see service in Berlin and so I think it would make sense to have this monster as Germany’s best defensive vehicle (at least anti-tank wise). It would be balanced by being crap against infantry.
Level 38 - STG 44 for Assaulters. (Duh!)
Level 39 - Bomber 2 Class: Panzerschreck.
This is Germany’s icon bazooka and would be a nice top tier reward and icon weapon (like the IS2 1944, I cannot not see them adding this tbh).
Level 40 - King Tiger (Tiger 2 Henschel)
This is one of the most iconic tanks of WW2 and with its up-armoured mantlet, it will be even more capable than the P at survival.
Although Level 40 is likely to be the max rank (and that Darkflow said they won’t be altering any levels which is eh…), I would still like to see these in some form (Ideally event vehicle, but premium is more likely):
-Brumbar Assault Gun.
The Brumbar saw extensive use on the eastern front and I’m pretty sure some were used in Berlin or Seelow, and since it would be unique as it’s basically the child of a KV2 and Stug, it would be a fun anti-infantry tank.
-Katuysha.
Before you ask, no I’m not on cocaine, hear me out. I think this vehicle makes a lot of sense being in Berlin considering it was heavily used there and with rocket tanks being in the game, I can see this being a premium. It would be excellent against infantry but as fragile as class, meaning any tank or even regular grenade can kill it, making it balanced (hopefully).
-Ostwind
This would be a nice AA to counter planes and decimate infantry, but obviously you would be sacrificing your anti-tank ability. To be this is the most historically accurate SPAA to use considering the Coelian was made of wood and Ostwind 2 never actually existed.
-ZSU 37
This would be a nice match for the Ostwind in terms of gunnery and being open topped. It also isn’t an open milk truck and so wouldn’t be useless.
I hope these SPAA are added to the progression tree somehow rather than being premiums or even event vehicles though, as anti-air is lacking yet I feel would be very important as a solid counter for annoying CAS.
Curious to see what everyone thinks!