Originally Posted by Slorkuz
(Blue Tracker / Official Forums)
With the continued popularity of the Dungeon Finder, many players have been asking for a way to group up with real-life friends who play on other realms to take on instances together. Today, we wanted to give you a heads up about a new feature currently in development that will allow players to invite Real ID friends of the same faction to a party regardless of the realm they play on, and then queue up for a 5-player regular or Heroic dungeon.
As this is a fairly complex service to develop, we don’t have a release date to share quite yet. It’s important to note that as with some of the other convenience- and connectivity-oriented features we offer, certain elements of the cross-realm Real ID party system will be premium-based, though only the player sending the invitations will need to have access to the premium service. We'll have more details to share with you as development progresses -- in the meantime, you may begin to see elements of the feature appear on the World of Warcraft PTR.