From the latest blog post:
At launch, players will be able to transfer between worlds freely. However, once server populations have largely settled and stabilized, world transfers will be restricted to once a week and cost a variable amount of gems based on the population of the world being transferred to.
Which is a great relief! I’ll now close the world vote, and designate Gandara as our starting world, with the flexibility to move during launch if we hit any problems.
The free guesting feature will not be implemented at launch, so it’s important we play on the same world.