I thought it was quite a bit more than a cameo. She was pretty much a main character and probably had more screen time than the Silver Samurai bloke who's name I've forgotten. As for having either of both of them back in DoFP...I don't think so. At least not this time around. It's unclear at this point how much time is going to be spent with the original cast vs. the First Class actors. It's bad enough bringing Xavier back from the dead exclusively through end credit stingers (two of them no less!) but dropping a not dead, not batshit crazy and not an uncontrollably powerful Akira/Tetsuo style superbeing Jean Grey with little to no explanation would just make matters worse. Same for Cyclops really. Yes we never actually saw him bite it and yes there wasn't a body and YES being disintegrate didn't stop them re-hiring Patrick Stewart, but come on! He's either dead or gone and if the story isn't centered around what exactly happened to him if he's not really dead or on how they're getting him back if he really was, it's best just to leave him out of it IMO. I have to be honest, in TLS, I was more annoyed at how Rogue was handled than either Jean or Scott. I actually hope that in this film they'll have her flying and tossing people around Ms. Marvel style and I won't even care if there's no explanation!