.@talachit Mage talents have received significant revision. Currently: 12 brand new, 3 existing/old spells now talents, 4 w/ major changes.- Celestalon (@Celestalon) February 26, 2014
This sounds like a lot of new talents, not just to name, but in general. Twelve are entirely new, and another seven are either existing spells or old spells changed into talents or major revamps of talents. Frankly, I'm a little envious -- I wish Warriors were getting this kind of change.
Edited to add: Celestalon mentioned in a tweet that there are 28 mage talents in all, not 21, because some are spec specific, so the number of 12 above ends up being not quite half.