So, they released this today
http://miku.sega.jp/info/adiary.cgi/0300#tm1320977579
A new event, called Miku no Hi Daikanshasai (Miku's day great thanks festival) is to be done on March 8 and 9, 2012. Unlike the previous events, which were performed at the incredibly small Tokyo Zepp, this one will be performed on the Tokyo Dome, which has a much larger capacity. Also, there are four events planned for two days, and it is going to be produced by Sega once again.
In other words, this is going to break a world record in awesomeness.

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