Yes, don't put all your eggs in one basket. I'm so glad when I see this message from WeChat. Just explain a little bit. There are several different GI forums in China, including but not limited to bbs, Weibo, and WeChat. All of them give out the cbt access as event reward. I've followed them for a long time, and finally I can access to the cbt3 for sure.
As you know, the CN server is set to begin earlier than others. I'm gonna keep updated on what the new content will be in cbt3 so that you guys can have better preparation before getting in.
Hope all of you are in beta, good luck!