Mage Tower requires you complete the quest line that "unlocks" the new traits ending in Concordence. *Note: You don't have to do this quest line anymore to actually unlock those traits*. This might also require the Order hall quests, but I don't think it does.
Class mount requires you complete both the Order Hall Campaign and the Legionfall quest lines.
Edit: Balance of Power requires some questing in Azshara as well as the Order Hall Campaign.
There's a nice link on Wowhead that tells you exactly what you need to do. I'll edit again when I find it.
Edit 2: As promised -
http://www.wowhead.com/new-110-playe...d-requirements