Ursoc did come back to life. But we killed him in wrath
The Furbogs in Grizzly Hills used a sapling from the failed world tree in hopes of bringing back Ursoc. It worked, however the sapling suffered the same fate as its predecessor and was corrupted by Yogg-saron. This meant that ursoc was corrupted by Yogg-saron as well. We are then forced to kill him and cleanse his spirit from the god of death. After that Ursoc went back into the dream and got taken over by the nightmare (basically old gods) in the guardian artifact chain. That poor bear can NEVER catch a break
It makes me sad when people commenting on a lore forum forget one of the major story arcs of Grizzly Hills
On a different matter, did anyone else notice this inside the cave
http://i.imgur.com/ak1dlmY.jpg
it is called Remnant of the void. Some say it is what triggers a Xal'atoth whisper