There are two new hallways, and down one hall way there is "End Time," "Dragon Soul," and "Hour of Twilight." in that respective order. Down the other hallway is the "Well of Eternity." Now, I don't mean to knock WoE down a peg, but that hallway looks like it should belong to Dragon Soul. We're about to take on Deathwing...DEATHWING!!!!! All he gets is some hole in the wall, not even some badass portcullis.
I know this is rather, VERY, nitpick of me to point out; but have some respect for the Dragon who is trying to destroy Azeroth (that does sound kind of odd now that I think of it). I'd be like giving the Lich King a closet inside the Shadow Vault...just sayin.