it can't be midgardsormr becuase that's wrapped around the Agrius, in Mor Dhona. This is clearly a giant slab or rock, jutting upwards. I suppose it COULD just be misshaped earth from the calamity.... buuuut its pointing in a different direction than the huge aether spire in the center of the picture...
oh and if there was one thing I absolutely LOVED about 1.0, it was Coerthas!!!
(also the wall of the Snow Cloak, where Sobek pops can be seen glowing... I'm betting its gonna melt soon, and give us access to new areas.... or I hope)