http://www.uesp.net/wiki/Morrowind:Ascended_Sleeper#Ash_Ghoul

if you read this you will see information about the ash creatures of red mountain having a relation to corprus, the ash ghoul and ash slaves, and even the ascended sleeper.

discuss.

The Sixth House has return! Dagoth Ur has return and the world shall fear him once again. The Sixth House shall rise back up slowly starting from this island and than the rest of Morrowind and beyond. Dragons, Heros, Daedras.... it doesn't matter, House Dagoth conquers all! With Akulakhan 2.0 nothing could stop them now!

i doubt that, but corprus could if someone took over his work. if it has something to do with the heart of lorkhan then it is entirely possible for corprus to return.