You did read the OP, right?
You do realize that Arcane Mages haven't been top end DPS for over a year, right?
I'm not sure this is right, the top three classes are all hybrids. Elemental shamans doing more damage then arcane mages and mutilate rogues? Arms warriors out dpsing warlocks? Something doesn't add up here.
Either that, or Blizzard needs to start fixing things ASAP.
Once the arcane mana minigame starts arcane is no longer the optimal mage DPS spec.
Arcane is the best spec for fights that are shorter than the duration of your cooldowns. Hopefully Arcane stays as bad as it is right now, so I don't have to suffer being forced to play as Arcane again.
But he pulls 10k dps on bosses in heroics.
Seriously though, these numbers will be a probable reflection of the first tier of raiding.
Let's just hope that Mastery plays out like Blizzard hopes and they're able to fine tune everything closer to where it should be.
Hopefully... All we can do is wait and see.