Very doubtful. Most likely, at this point in time, the CoC will have fully become Sheogorath, same as the other mortals who became Sheogorath before him, which will re-instate the curse on Jyggalag. No real reason to think the cycle has been broken.
I wouldn't be surprised if Sheogorath returned same as always with little-to-no mention of Jyggalag.
um... NO mortals have become sheogorath before.
that is what the focus of the shivering isles expansion was for... it was the END of the cycle of order/madness.
i mean, if the cycle "ended" countless times before, and mortals became sheogorath before, im sure it would've been mentioned, and i dont even think that would warrant an expansion pack to focus on something like that if there was nothing special about what happened.
where are people getting these crazy "facts" of theirs?
someone in this topic already thinks sheogorath being reborn in the champion will make him look younger... thats stupid, since a daedric prince can look however they want, if sheogorath WAS reborn through the champion, he could actually make himself look thousands of years old if he wanted, he wouldnt just automatically be young, he'd appear however he wanted!
now you, saying other mortals have become sheogorath before and jyggalag supposedly seperating from sheogorath during other grey marches... complete BS, sorry to say.
again, there would be no point of the expansion if there were previous champions and victories over jyggalag... NO point at all.
that was the first time ever that sheogorath called in a champion im sure, and the first time a mortal took up the mantle of a daedric prince, as well as the first time ever jygglag was seperated from sheogorath and was free to traverse oblivion once again.
anyway, back on topic... im sure we'll see some references to oblivion and the shivering isles events, i mean... bethesda loves their easter eggs, and references to past games, so we'll either see books, or NPCs will make references in discussions.
maybe we'll find storytellers who tell the stories to children?
that'd be pretty cool, since children are in the game now, they should have elders telling the kids stories from what happened during the oblivion crisis, afterall... elves can live a very long time, 200 years would be nothing to them.