Interestingly, there was a "shincha" "stickied" topic for Chinese greens in 2010, but there was just not much excitement nor posting.
There is simply a lot more excitement and posting and interest in Japanese shincha, it is an annual celebration.
As far as topics and posting in general, nothing is dictated by some higher authority, nor is there a hidden agenda. Anyone is free to post a topic, and anyone is free to post.
So, if someone wants to create a Chinese shincha topic, please feel free to do so, I will sticky it ... for as long as it is warranted by the posting.