I'm not sure why they do this. They could milk money from us by adding " 
British - German comando " and maybe in November add " 
US Marine - Japanese Empire Army ".
That makes more sense to me. 
Now they do it like this, how are they going to fit the Japanese in ? British - Japanese ? 
The Map Hill 331 show us something different from snow: Mud. Mud is good for the Pacific war but now they do it like this.
Don't get me wrong, I'm very excited about the new 2 armies, it's just that it could have been better if it was 
UK - German Comando or 
US - Japanese.
Sorry for the English btw, it's not my native language.
Btw, There could be a lot of thing for Japanese: 
- They could make more map next to the sea so Japanese can required heavy Arty from Battleship, order a Kamikaze airplane down to the enemy
- Camo in Cover or Dig in 
- using Light Mortar
- Banzai Charge with 3 squads will make enemy light suppress. 
- Self Explode unit.
- Bomb trap in house, road, v.v.v 
It's just that their tank is kinda shit O_O. 
I just check this: 
http://en.wikipedia.org/wiki/Japanese_tanks_of_World_War_II and yeah, doesn't seem like they got medium or heavy tank. It will create problem for Relic if they want to bring them in