X-Man is making a Comeback.
From the CBR interview it sounds like he'll still be Shaman and won't be depowered.
There was one “Dark X-Men” character that Cornell could talk about in some detail though. He's not a team member, he's a target. His name is Nate Grey AKA X-Man. The son of an alternate reality's Jean Grey and Cyclops, Grey first appeared in the 90's X-Men storyline “The Age of Apocalypse.” At the close of that storyline he found himself in the mainstream Marvel Universe where he put his vast mutant powers to work as a hero. During one of those exploits it looked like Nate sacrificed his life to save the world from alien invasion and “Dark X-Men” marks his return to the Marvel Universe.
“He's near omnipotent, the mutant shaman, and he's terrifying to my cast of characters,” Cornell said. “That’s because he's exactly what they don't want in play right now: a very powerful, charismatic, alternative leader of mutant affairs. And a Summers, to boot. X-Man is dreaming his way back into the world, the deadliest possible hero.”
Unfortunately for the cast of “Dark X-Men” they’ll have no choice but to confront Nate Grey because he quickly becomes part of an important mission that Osborn tasks them with. “The story is called ‘Journey to the Centre of the Goblin’, and, though it won't become clear until towards the end, that's exactly what it becomes about, getting inside Norman Osborn's head,” Cornell revealed. “On the way, we encounter the world haunted by Nate, the cult that S.H.I.E.L.D. became, and the twisted psyches of our four leads, which skew the story in ways that might surprise you.”
. . .
Kirk couldn’t reveal much about the other characters he’ll be drawing in the mini-series but he is currently brainstorming possible looks for X-Man. “I haven’t drawn his grand entrance, yet but I suppose his look will be closer to his more recent appearance with the tattoo on his chest but there might be a few tweaks to his design. I’d rather not mess too much with it though. As much as I enjoy designing and redesigning characters, I prefer not to do it if it isn’t really necessary.”
More Info
The Dark X-Men Fight Again
http://comics.ign.com/articles/101/1012440p1.html
X-MAN Is Back: Cornell & Kirk on DARK X-MEN
http://www.newsarama.com/comics/080911-Cornell-X-Men.html