2) A simple frost nova now counters Warrior and BM burst CDs
3) Gag Order, their biggest counter, is removed. Mages now counter warriors.
4) Word is they can now spellsteal Demo warlock's aura, being the counter for them as well.
5) Now the ultimate Shaman killer with deep into blanket CS.
6) No significant nerf. Ring CD is the only one that matters, and barely at that.
In before the lovely DDF mages come to complain about how bad they have it. No other class is getting this many indirect buffs in 5.1, and certainly not when they are already so strong.