"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.
In time, we’ll also introduce free “guesting,” which will allow players to visit other worlds as guests as long as they have friends on those worlds. This feature will be free, but guest players will not be able to enter World vs. World, and the Power of the Mists bonuses from their home world will continue to apply to their characters."
The bolding and italics are mine. Just wanted to point out that folks can get to Sanctum of Rall free upon launch.
:)
