I too would love to see China in game at this point in time, but if the devs do an expansion based on china I see it as something that will be towards the end of the games life cycle. Johan has stated that the main reason he doesn't want more start dates is because of the massive amount of upkeep required for them every time the map changes or a new system is added, hence I believe that a massive map expansion would be something the devs would only do once they feel that most systems and map redoes (major ones anyways) are set in stone. Plus it wouldn't cause a heavy shift in development attention from the rest of of the world as it would be towards the end of development when all of that should have been taken care of.
Either way though, I feel that Imperator and its era is the prime time to add China from a gameplay standpoint (similar government/army systems and balkanized region) without it being a completely different beast from everything else (i.e. CK2 time frame).
Either way though, I feel that Imperator and its era is the prime time to add China from a gameplay standpoint (similar government/army systems and balkanized region) without it being a completely different beast from everything else (i.e. CK2 time frame).