This question may be answered somewhere within all the nerf/buff posts lately, but I'll ask neverthenless:
CM tooltip currently says: "Multiplies the critical strike chance of your Fireball, Frostfire Bolt, Pyroblast, and Scorch by 1.5"
Now, as far as I can remember it was nerfed back from 1.5 to 1.25, then just recently buffed up to 1.3 again. Is this Blizzard slacking on updating its tooltip, and therefore showing the wrong numbers, or am I missing something here?
I, for one, have absolutely no doubt that Arcane, as an entire spec, in both PvE and PvP is going to end up in the toilet throughout the entire MoP expansion. You can bookmark this post, screenshot it if you wish, but you will see that that statement of mine will stand the test of time.
This is the right answer. Tooltips require client-side patching. Client-side patching requires a lot of testing before deployment and therefore these changes are usually made together with the big patches.