because there wasn't any major huge decisive victories
Thats why we dont see China "Nationalist" or Warlords in Games. The only game i know, whit all chinese factions fighting between them and against japan in Hearts of Iron 1,2 and 3.
Well, acutally, i can clearly see myself and many other guys playing as Hungarian, theres a couple of guys working on it, so it could be possible, same whit the Finnish (If not expect heavy attacks from the Flippy faction), France is more likely going to be in FH2 (A weapon shows the french flag, and since Bir Hakeim has been deleted from Gazala, there could be a separate map called Bir Hakeim.., and again, Johannes will attack, for sure).
But these factions have to waiiiiiit, alot.
I think the next theater would be the Eastern Front, or italy, italy seems possible since it needs nothing but a some new statics and stuff, the Eastern front needs alot more, and not to talk about the Pacific.
Could be interesting, the devs can make a deal, whit BFK. They have the Czech Zb vz.26 (China had these Machineguns), the Gewehr 98 (When i played it, i tought it was a Gerwehr 98 or a Chiang Kai Sheck rifle) and some other stuff. And FH2 can give something else, like some coding or animations.. who knows, it would be good.