Check out the new post blog post at arenanet http://www.arena.net/blog/choosing-and-transferring-worlds-in-guild-wars-2 & here is our daily news on it. http://guildwars2pc.com/2012/gw2pc-daily-news-servers-transfers-gems-guesting-feature/
Very happy about this, especially the guesting feature. It means that people won't have to pay to switch servers just to play with their friends. Hurrah for ArenaNet!