Okay, thanks. So my questions are:

1) 已经达到50人，降价为349元，399元支付的朋友在确认函发出收到之后联系我们支付宝退差价即可。

If i understand correctly this means that i can receive 50RMB back. I received the confirmation letter already so that means now i can ask for 50RMB refund or i should wait when i receive the keyboard?

2) What is the estimation shipping date of the first batch? As i can read in the letter it is January, but 1-15 of January or 15-30?

3) I bought silver aluminum case but i also want to buy black one later. Will the second round of the group-buy be? 

4) Is it possible to make anodized aluminum plate as an additional to stainless steel one?

Thank you for any information!