Quick post about this, a few days ago there was a guy on the forum that claimed to have info on the Xpac.
He did say "It will be called Warlords of Draenor" and will have this and this and this (not sure what he claimed).
ALOT of people as usual made him out to be a fool and said "Blizz will never call their Xpac that" etc. and that he was talking crap.
Now ofcourse I understand where this comes from as he din't link a source... but here we are...a few days later.....with Warlords of Draenor trademarked... so I guess he might be right after all.
Not saying its 100% right, but I do think it was funny that he was correct.