My apologies if a similiar thread already exist.
Looked through some spells and came across http://db.mmo-champion.com/s/75192/weakening/
Baron Geddon returning, most likely in hyjal.
Molten Core was merely a setback!
Will more bosses from MC make their apperance ingame?
Edit: http://img6.imageshack.us/img6/2752/barongeddon.jpg