I'm sure a lot of you noticed this earlier, but I was on the PTR late last night and noticed that my T5 Set bonus is now 5%dmg boost to Arcane and 5% more mana. That along with the 200% mana cost for casting AB multiple times means I will definitely be switching to Frost 70-74 then Frostfire at 75. I'm not sure what they are thinking. Blizz has stated that they want all three trees to be viable as a raiding specs, but right now I don't see the Arcane tree as being viable as more than a support tree. The 20% dmg boost is the only reason the mages in my guild spec'd into it. We run with a shadow priest and shaman in our group for the mana support. Are any of you going to be using the Arcane tree as a leveling and raiding spec? I think Blizz really wants us to be elementalist.