World of Warcraft Mage Talent Trees Preview

The guys at IGN PC have put together a three-page preview of Blizzard's planned changes for the Arcane, Fire, and Frost Mage talent trees in World of Warcraft. Tier 4 Fire talents:
Improved Scorch
Your Scorch spells have a 33/66/100% chance to cause your target to be vulnerable to Fire damage. This vulnerability increase the Fire damage dealt to your target by 2% and lasts 15 seconds Stacks up to 5 times.
Note: Previously five increments of 20%. Two more talent points freed.

Improved Fire Ward
Causes your Fire Ward to have a 10/20% chance to reflect Fire spells while active.
Note: Was previously 20/35%.

Master of Elements
Your Fire and Frost spell criticals will refund 10/20/30% of their base mana cost.
Note: This is a new ability and, interestingly, affects more than one talent tree.