Since everyone else (and their dogs) have commented about the mage changes in 2.3.2, so must I. Let's get the easy parts out of the way first.
Trainable Ice Block: A vital skill for any PvPer who wishes to live at least 10 seconds. The same reasoning which allowed Improved Arcane Explosion and Evocation to become core class skills applies here as well. Frankly, I'm a bit surprised that it wasn't done sooner. Previously I was worried that removing Ice Block would remove one of the few spells that make the frost tree distinct from Fire and Arcane. Fortunately, I was wrong.
Conjure Mana Gem (rank 6), which restores 1800-3000 mana and has three charges: Again, a no-brainer. The current rank 6 Mana Gem was simply pitiful, enough for only a few spells. This one is equivalent to a Super Mana Potion, only on a different cooldown.
Then the juicy part. Icy Veins:
Icy Veins (NEW Frost Talent) decreases casting time of all spells by 20% and increases the chance your chilling effects will freeze the target by 25%. Lasts 20 sec. 3 min cooldown. It is now in the Cold Snap position in the talent tree.
Although Blizzard did break Frostbite completely, a fix is scheduled to appear just in time for this gem of a skill. 20% Spell Haste for 20 seconds is a very nice DPS increase, especially if it also affects the Water Elemental. Some testing is required to see whether this stacks with other periodical Spell Haste effects, but I wouldn't be surprised if some Black Temple & Zul'Aman-farming troll frost mage was already drooling about the concept of being able to chaincast Frostbolts almost as quickly as the Global Cooldown allows.
As for the PvP side, +25% proc rate for Frostbite is pretty significant. Coupled with the casting speed increase it means that a well-timed Icy Veins allows the frost mage to both disable his opponent and follow up with a devastating Shatter combo before he is able to react.
..which is why I doubt that this talent survives the outcry.