They're thinking of starting transfers a few weeks after launch, but no final details yet. (That likely now won't include legacy to new world transfers, but maybe legacy to legacy. And there may be a fee.)

Quote Originally Posted by Bayohne View Post
A12: As this is a game with world barriers, we will be preparing this service so you can move to the same world as old friends as well as new people you meet and become friends with through the Duty Finder. We plan on starting this fee-based service that will allow you to transfer to the world of your choice around 2-3 weeks after launch. Once we have finalized the details we will be sure to let you know.