I honestly hope it's someone entirely new. The X-books need someone like that. It feels like it's been a while since the X-men had a genuinely new character to take things in a different direction. Gabby is great, but she's a derivation of X-23. Other than Goldballs and Tempest, I honestly can't think of too many quality X-men characters who have gained great notoriety. Maybe Major X is that character who gives the X-books a boost, just in time for Disney's take-over of Fox, although I'm sure that's just a coincidence.