It was leaked yesterday, but Blizzard has now made it official: World of Warcraft Classic, the retro version of the huge online game, will be extended to include first expansion The Burning Crusade this year.
That means an increased level cap of 70 (Classic players will actually outlevel players on the modern game, which has had the cap squished to 60); an inter-dimensional adventure through the Dark Portal to the trippy, broken world of Outland; the addition of the Blood Elf and Draenei races; arena player-versus-player, flying mounts and more.
As before, World of Warcraft: Burning Crusade Classic (it's dropped the "the", for some reason) will be included for free in a WOW subscription.