World of Warcraft Character Transfers Announced

Blizzard's official World of Warcraft community website has been updated with the specifics on how to move your character from a high-population realm to a low-population realm. Unfortunately, there is no way to transfer characters at your leisure... yet. The full announcement:
We are happy to announce the next step in our continued efforts to improve the stability and performance of our realms. Players with characters on high-population realms will now have the option of transferring their characters to a low-population realm. Dispersing the population across all the available realms will reduce lag and queues and improve the overall play experience for our players.

Character transfers are optional for players with characters on eligible realms. Each high-population realm selected for character transfers will have one designated realm to which characters can move. The first character transfer will be offered for the Arthas realm to the Nathrezim realm. Click here to see what other realms are currently scheduled for character transfers. For more information, please read the character transfer F.A.Q. located here.

This service is being offered to a single high-population realm at first to ease any possible load created by character transfers on the live service, as well as isolate any issues that may arise. We will announce further character transfers once they are ready for release.