According to Blizzard poster Ghostcrawler, the mana cost of Fireball, Frostbolt, Frostfire Bolt, Arcane Blast, Arcane Missiles, and Arcane Explosion will be reduced as a result of the fact that mages are still having mana problems. Here's Ghostcrawler's post :

We think mages are still having mana problems and don't want to reduce Evocation's cooldown anymore. Nor do we want to buff mage armor too much more or using e.g. molten armor seems pointless.

Instead, we reduced the mana cost on Fireball, Frostbolt, Frostfire Bolt, Arcane Blast, Arcane Missiles, and Arcane Explosion.

What do you think about the mana problems plaguing mages? Discuss it in our mage forum .