So, here they are:
Honestly I find the boring. Not necessarily bad or lackluster, they're not. I mean, 2-set bonuses are typically lame so it's not an issue, but I really wanted the 4-set bonus to be something slightly more entertaining.Item - Mage T15 2P Bonus (New) When Alter Time expires, you gain 5,100 Haste for 30 sec.
Item - Mage T15 4P Bonus (New) Increases the effects of Arcane Charges by 20%, increases the critical strike chance of Pyroblast by 5%, and increases the chance for your Frostbolt to trigger Fingers of Frost by an additional 6%.
However, as far as Arcane goes, the 2-set bonus might be good incentive to use the Glyph of Arcane Power.