???
It simply cannot be possible that he died in Ulduar, althought wowwiki refers to him as "Killed" not "Defeated". His influence can be felt everywhere in Northrend and knowing that it feels like impossible that he could be so easily killed. Did we only defeat one of the "thousand maws" or this was his main body( Which I find very unlikely). If we compare him to C'Thun, who had absolutely no influence outside his Temple, and his influence inside was only his voice. Yogg-Saron seems to be much more powerful than he is ...
Anyone knows?