When Mists of Pandaria hits, Blizzard will be introducing a new system of cross-realm zones to World of Warcraft. The new zones will allow for the grouping up of players in areas of that have a lower population, such as low-level zones. Capitals, auction houses and other high population areas will not be joined, and there will not be any level restriction for entering cross-realm areas. See the FAQ for more details.
Source: Battle.net
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