is this confirm with a blue post cuz all i see is this from blizzardMage (Skills List / Talent + Glyph Calc.)
Arcane Spec changes
It looks like the mage was hotfixed yesterday to make a few changes to the Arcane tree
* The Arcane Blast buff is now instantly consumed by Arcane Missile to prevent people from clipping their cast to get a boosted Arcane Barrage too.
* The Glyph of Arcane Blast now gives 3% additional damage and doesn't work on Arcane Missiles anymore.
and it doesn't state any of what was posted on MMO-Champion nor any other site and i still see my mage doing 5k dps easy in 5man heroics.