I don't know actually. It's Jaedan who keeps talking about a move windows
I'll keep my characters on Blade's Edge cause I like me a PvE server and I also like my armada of maxed out professions and CBA to level characters enough to accommodate that on a new server. Already did that once, when I "moved" from Ragnaros to Blade's Edge
I'll probably use my level 100 boost on a character "over there" tho.