Good news, guys. Polymorph: Rabbit is finally here. You can stop writing angry letters to Blizzard; they've finally heard your pleas. On the PTRs for patch 3.1, you can now change your opponents into a rabbit, providing you a much-needed alternative to only being able to change them into a sheep, penguin, pig, turtle, black cat, serpent, or a smoldering pile of ash. I think I speak for everyone when I say: Thank God. We can only hope it'll cost a stupid amount of gold to procure.
Aside from that (and I hope you can see the sarcasm dripping from every word up there), there just isn't that much to get excited about here for Mages. We were promised several things, and you'd have to be truly skilled at seeing silver linings to view any of the documented or undocumented changes we know about at this point as Blizzard even approaching delivery on any of those promises. I'm not thrilled.
I'll go in depth on these changes in Saturday's Arcane Brilliance, and maybe we'll know more by then, but for now, let me list the changes with my brief impressions of them.