Nova Crystallis: How long after the game launch do you expect to allow Legacy characters to migrate to new servers?

Yoshida: We are thinking around six months. We will be checking the data on our side and we will see how the players are mixing, where they are going, and how the server balances are. We may push that date forward depending on these factors.
http://www.novacrystallis.com/2013/0...per-interview/

Easiest thing I could find. I'd have to go too far back in the dev tracker to find it from a community rep, so have at it if you want something more official. :P