A nation tickets

[Chibi-Chan]

You're welcome! =)
Until now the fanclub lotteries aren't over. If I remember correctly TA will get the results at the end of this month, so I guess it will take a while until the general sale starts. I just checked the official site and there isn't any info either yet. I think because the line up for Mie and Nagasaki was out earlier than for Osaka and Tokyo, the ticket sale also started earlier. I highly doubt that a-nation will be sold out via the fanclubs only, so don't worry.
Regarding how early Ticket Pia usually puts the tickets up, I can't say for sure. But for MUCC it was one and a half month before the show, after the fanclub sale ended. As long as the fanclub lotteries/sales aren't over, there won't be a general sale. Just check the official website from time to time for tickets and you will be fine I think. =)