We had difficulty distributing the Live build using our normal distribution process, so we have been distributing it manually to file servers around the world, one server at a time. Therefore, players on some servers will receive the update sooner than players on other servers.

We expect to complete distributing the build to all servers within the next 15 minutes, and when the distribution is complete, we will open access to Elona and start the preview event.

http://www.guildwars.com/support/gameupdates/