Hrm. Interesting... Drastically different from 616, and I certainly hope that Kirkman's take on Pheonix... Personally I am very glad he's not rushing into it, as its definitely an issue that needs to resolve over time, and I think he's still getting into the swing of the book (honestly, each issue gets better and better)...
But I need to ask whether it will also be drastically different from the Movieverse... I mean, I have no doubts that it WILL be different from the movies, but I'm a little nervous about any writer approaching Jean as a person with multiple personality disorder... I just feel like there are much better ways to work up to that.
Most importantly, that story needs to be Epic. Pheonix can't be a Sub-Plot, and the elements for an Ultimate Dark Pheonix Saga have already begun to fall into place... If Ultimate Bishop is coming back from the future as a member of the XSE to stop Cable from Killing the X-Men (like I suspect), and he is also the same teenaged street thug mentioned in the Bendis UXM arc, then the future Cable is coming from isn't that long away... Perhaps he comes to stop Jean from ever turning evil... We also have the Shi'ar, who I am still thinking might be Aliens but regardless are essentially the same people who were once the Hellfire Club, who worship this highly destructive omnipotent being. One of the highest ranking Hellfire members during the original Pheonix Saga was Emma Frost, and she needs to be getting her funding from somewhere... At the same time, we have Apocalypse using his horsemen to ready his entrance into our world... And, somewhere, Magneto has to be planning something. The Ultimate Universe from the X-Men's perspective is, to use the cliche, a powderkeg. One spark and everything falls apart...
There needs to be a Saga, and not like a six part arc at the end of Kirkman's run... There needs to be an epic story told here and that should take a good twelve issues at least.
I'm interested to see what happens, to say the least.