Some class tuning hotfixes have been pushed to the Patch 10.1.5 PTR which buffs Frost Mages.

Class ToolsArcaneTalentsFireTalentsFrostTalents

Talents (3)

 Frostbolt grants you Fingers of Frost 25% more often and Brain Freeze 15%20% more often.
Effect #1 Effect #2 Apply Aura: Modifies Effect #1’s Value
Value: 1520%
Affected Spells:

Talent position has changed.
 Blizzard has an 30% chance to increase the damage of your next Cone of Cold by 8%, stacking up to 15 times.

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