Well considering more or less the whole of China goes on a one week holiday it might be that they wanted to give the news before the holidays, and we will get it more officially during that time.
Makes sence ...
If you care about why they anounced it in china ... my question would be more like why they didnt in rest of the world. :-/
I mean sure, we dont have any holidays (at least i dont know about any) but they totally could translate the same status to english and post it aswell in my opinion. :-/
Maybe im overeacting here (since im really geting sick of this attitude from other companies ... especialy Blizzard), but it seems just as if they were telling: "China means more for us than the rest of you." :-/