Is there any real confirmation from them that that was Mannoroth? Just curious because other than the main universe plot with Mannoroth being involved, how do we know for sure that was Mannoroth in this universe and not another pit lord?
Also, just posting this because it's a funny coincidence, but http://poizon.p.o.pic.centerblog.net/2z218bld.jpg
He almost looks like he's in the exact same position as the cinematic pit lord when he gets hit by the iron star and chained with the lance or whatever. Still a different universe so it's just coincidence, but pretty neat.