Patch 4.2

Patch 4.1 is live for one week now and Blizzard already released a video for the new Firelands Zone-Instance.In the video we can see all the bosses in the new Fireland raid instance

Bosses :
Beth'tilac
Lord Rhyolith
Alysrazor
Shannox
Baleroc
Majordomo Staghelm
Ragnaros