Players are now able to directly invite members of the opposite faction to a party if you have a BattleTag or Real ID friendship, or if you are members of a cross-faction WoW Community.
Premade Groups in the Group Finder listings for Mythic dungeons, raids, or rated arena/RBGs are now open to applicants of both factions, though the group leader may choose to restrict the listing to same-faction applicants if they so choose.
WoW Communities now have the option to be cross-faction, while Guilds will remain single-faction.
Random matchmade activities like Heroic dungeons, Skirmishes, or Random Battlegrounds will all remain same-faction.
The following instances are not cross-faction:
Trial of the Champion
Trial of the Crusader
Vault of Archavon
Icecrown Citadel
Baradin Hold
Siege of Boralus
Battle of Dazar’alor
Darkmaul Citadel (Exile’s Reach dungeon)
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