Right, so Anub'arak has returned from the pits of a 5 man instance, most likely via some uber underground tunnel, and PTR has started pwning his backside for the time being.
The raid seems to be a very 'traditonal' fight, One tank on boss and another on adds, with the addition of Perma frost which hangs over head. From what I have gathered its perma frost all the way till P2 (the folks kept mentioning P2) that hangs over head. Ofcourse no idea if they is a tank debuff, such as Kologarns, or a debuff for frost damage, but suppose its a good start to discuss some 'tic-tacs' from the video ^^