I'll need to think about how best to handle the 2.1 to 3rd edition transition. The 3rd edition is almost twice as large as the 2nd edition, and has undergone a deep editing scrub too.
As for a Simplified Chinese translation, that would be great! I'd be happy to work with you after the 3rd edition releases. I don't know much about Chinese, but hopefully we can create a base copy of the rules. I'd be happy to release it for free as a PDF, too :)