In the World of Warcraft: Mists of Pandaria beta, we're introducing a new technology that will enable players to meet up and group with other players in under populated areas of the world such as low level zones or areas that other players may have outleveled or moved on from. This technology will allow players to form a group with other players from within a select pool of realms in order to quest just like they normally would while still allowing the social structures of their home realms to remain intact.
During the initial phase of testing we will be sharing the following zones between the available beta realms: Northern Barrens, Ashenvale, Azshara, Darkshore, Westfall, and Silithus. We are also able to split over-populated zones and will be testing this new technology on the Pandaren starting area (turtle zone).
For beta testing purposes, we will be matching up all realm types whether they are PvP or PvE. This is different than what we plan to do for the live realms, however. For the live realms we will be matching realm types: PvP with PvP, PvE with PvE, RP-PvP with RP-PvP, and RP-PvE with RP-PvE. As always, we plan to keep an eye on constructive feedback while in testing of this new technology.