They are conducting an interest check within the Chinese lolita community. I don’t know how a non-Chinese can register their interest and I won’t be able to help anybody with it. However you can check their shop often for updates.
Sorry I didn’t help you to check this earlier, I didn’t have the time. The reason why you don’t see it in their shop is because it is not for sale yet, at all. It looks like this will only be sold if they have enough domestic customers. I’ll come back on Sunday to translate the rest of the info!!