In a recent blog entry on the official Guild Wars 2 website, Community Lead Martin Kerstein announced that on January 28th the game will get a new feature called Guesting. This will allow players to access different servers to play with friends without changing worlds.
Players will be able to jump to other worlds so they can play with their friends without the need for a character move to that world. There are a few restrictions on this new features;
- Because (different from a world transfer) we are not moving your character between data centers, you may only guest on worlds in the same region as your home world. Players on North American home worlds cannot guest on European worlds or vice versa.
- You may not participate in World vs. World on your guest world. If you choose to enter World vs. World on the world you are guesting on, you'll be moved back to your home world. If you want to play World vs. World on the world you're guesting on, you must perform a full world transfer to that world.
- You're eligible to guest on only 2 different worlds at a time. Each time you guest on a world, that world becomes one of your eligible guest worlds for the next 24 hours. After 24 hours, you may choose to guest on a different world. You may log in to any world you are eligible to guest on as many times as you wish with no restriction.
- Guesting on worlds that are full or highly populated increases your risk of being put into an overflow map.
They also state that with this addition there will no longer be free world transfers, and there will be a gem fee to get you character's home moved to another server. They recommend that you move your character to the server you want as your "home" prior to the January 28th update. There are also some other restriction that you can check out at the source link.