My 2 cents...

We killed the first 4 bosses in hyjal our first week in there, with the right strats i think this can easily be done. Anetheron just takes time to learn where to position healers, where to tank infernals, and for people to move to the tank spot when they have an infernal on them. Kaz is cake once people learn how to manage mana. Azgalor is also very easy with the right strat. Shadow resist for healers, nobody but rogues in the rain of fire, and people getting to the tank spot when they have doom.

After that i would head to BT until you down bloodboil, then back to work on hyjal and archimone.