Illidan, what have you done?!
(For this raid tier, the only normal boss we're showing in the progression is Kil'jaeden, and will show the heroic first kills soon!.)
10 tries to get Kil'jaeden sent screaming back to wherever it is the demons go.
We have two things to figure out to ensure a smooth kill. First, working out a rotation for the Large Orange Circles Of Doom™.
Second, finding the right Illidan in the second intermission.
Aside from that, just the usual raid mechanics, and we did this somewhat easily, improving each time (other than the occasional mistake where someone was launched off the platform!
For those who have not yet killed this Big Bad Demon, pay no attention the ... ahem ... planet hovering over Azeroth.
Azzurus, Bearcod, Carnival, Mesilana, Mirenna, Raewyn, Ripples, Shaada, Shandralore, Sindoriel and Valifadin