The JP official site has posted the official announcement that Vana*Fest 2012 is coming on June 23 & 24 in Tokyo. The actual event locale is to be announced.

Event website - http://www.playonline.com/ff11/event/vanafest2012/

This being the 10th "Vana'versary", I would like to think there'll be something big announced, especially since it's two days instead of one like last time.