If you already have a Gamer Launch account connect your Facebook account on your user profile first before using Facebook connect to login. Otherwise you may end up with a new account.
Direct from Blizzard:
December 2, 2014 Highmaul opens with Normal and Heroic difficulties accessible.December 9, 2014 Mythic difficulty and the first wing of Raid Finder (Kargath/Butcher/Brackenspore) unlock.December 16, 2014 Raid Finder Wing 2 (Tectus/Twin Ogron/Ko’ragh) unlocks.January 6, 2015 Raid Finder Wing 3 (Imperator Mar’gok) unlocks.
We should be raid-ready and prepared to go in 1 week from today!