World of Warcraft's orcs and humans will soon be able to fight together in raids and dungeons

pcgamer.com:

The cornerstone foundation of Warcraft is simple: Orcs over here, humans over there, and never the twain shall meet except to beat the hell out of each other. But times change, alliances change, and soon the divide between gaming's most timeless enemies will change too: Blizzard announced today that it is making changes to enable Horde and Alliance players to team up in dungeons, raids, and rated PvP.

It's a big change—World of Warcraft has been around since 2004 but the conflict in Azeroth goes back a full decade before that, to Warcraft: Orcs and Humans in 1994. With that in mind, Blizzard said the change is being guided by two basic goals: To focus on organized instanced gameplay, where «social barriers will have the greatest negative impact on people’s ability to access these experiences on their preferred terms,» and to make it an opt-in feature as much as possible to ensure that players who enjoy Warcraft's established fiction aren't suddenly thrown into a new, unwanted era of peace and cooperation.

Very roughly, here's how it's going to work:

Members of opposing factions in the same party will be able to communicate through the party chat, but will remain unfriendly outside of instanced dungeons and fully hostile in War Mode. But once they enter a dungeon, raid, or rated PvP match, all members of the party will be friendly and able to fully cooperate as though they were all members of the same faction.

It's happening.