Gamers from different World of Warcraft realms (servers) will be able to raid together when patch 4.3.2 is implemented, Blizzard has revealed.
You and your Battle.net Real ID friends can take on "older" normal or heroic raids as well as use Raid Finder.
You can form Battleground raids, too.
You'll automatically be placed in the same instance once banded together.
Note, however, that the recently added Dragon Soul raid can not be tackled by cross-realm raiders.
Blizzard yesterday detailed a beefy list of hot fixes being made to World of Warcraft patch 4.3, Hour of Twilight.