At most, it's Lee/Kirby-era Jean in some sort of time travel/AOA-style futzed up timeline arc.
Remember that kerfuffle on Brevoort's twitter feed a couple of weeks back? Marvel's not going to do a straight up resurrection of Jean because doing so means dealing with her marriage to Scott. Permanently splitting them up was part of the point of having Morrison kill her off. Scott and Jean as a couple in present continuity is verboten.
I get the sense there's another One More Day-style mega-retcon coming with Quesada & Co. jettisoning more stuff they don't like from continuity.