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.