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"It's old news that we'll be seeing cross-realm battlegrounds in the next patch, however, Blizzard has recently let us in on additional information regarding how the system works.  After 1.12, when you enter a battleground queue, you won't be entering a queue with players from every realm - simply from a select few.  Each realm is part of a \"battlegroup\" consisting of five to twenty realms, and you will only compete with other players within your realm's battlegroup.  There's already speculation on which battlegroup will contain the toughest competition, so place your bets now...![Thanks, obo]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2006/07/15/patch-1-12-cross-realm-battlegrounds-system/>