#1 - March 24, 2014, 9:49 a.m.
Normal and Heroic will allow groups to be built out of Real ID and BattleTag cross-realm friends, and all raiding options will be on separate lockouts—meaning boss kills in Raid Finder, Normal, Heroic, and Mythic will not be shared between them, and you can kill each boss in each difficulty for a separate chance at loot each week.
19/03/2014 12:07Posted by TakralusCurrent-tier Mythic raiding in Warlords will still be limited to players from a single server.