Dire Maul WILL be available at launch.
I'm against customizing raids, but I think we should try to properly limit available items.
No, we're not going to rollback items to old stats.
But DM was not available back at first in MC, and I strongly believe we should not have access to DM, as it massively increases our stat.
For a holy paladin:
EP pre-raid without DM : 808
EP pre-raid with DM : 998 so +190
EP with DM+MC+Ony : 1110 so +112
You'll get way more out of DM that you'd get out of all MC and Onyxia...
One could argue that DM was released on March, 7th, and that while Majordomo was killed on February, 10th, Ragnaros was only killed on April, 25th, thus with people have DM gear available.
But if you want to easily reduce people power, just dont release DM. Half of any BiS list is there.
At least D2 bosses wont be.
PS : And while raiding can seem easy to everyone
on paper, I'm confident most of the guilds wont clear raids that fast. Yes, top guilds will. Like on retail. Chromaggus was killed on the 2nd raiding night, right after the BWL patch.