I'm pretty sure we're gonna do
Nythendra
Elerethe Renferal
Ursoc
Il'gynoth
Dragons of Nightmare
Cenarius
Xavius
We'll probably go Dragons->Ursoc (depends on how strict a dps race the fight is)->Elerethe->Il'gynoth. That might change on mythic (because of additional mechanics, tighter enrage and heroic experience).
I believe we are taking them out in this order:
Nyth
Elerethe
Ursoc (hopefully this isn't a crazy DPS check)
Dragons
Il'gynoth
Do you guys really think ursoc will hit that hard? I mean it was alpha like 7 months ago, it might be tuned a little nicer.