The palm is now activating arcane power from Emilylowes's blog

Palm now has a two minute cooldown, and you WoTLK Gold can't activate arcane and palm power simultaneously. This will impact the way opener and other functions perform, but I'll get into it in a bit. Additionally, Arcane potency now increases the chance of a critical strike on the next damage bill following receiving clear casting and palm , so the palm is now activating arcane power.

In the same way, Arcane Power has been cut from a three-minute cooldown. to a cooldown of two minutes that now causes 20percent more damage. This will cost you 20% more mana, as opposed to 30% more damage costs 30% more mana in TBC. Arcane Empowerment is also changed to boost the damage of arcane blasts and Arcane Missiles. 

It also grants an increase of 3% for all damage dealt to party members and raid players. There are three classes that could offer this. Rep pallys are your BM hunters, and Arcane Mages cheap WOW WoTLK Classic Gold, therefore you must have one of them and we're one of those specifications, the classes that are able to offer that off.