I hope to god that it's not Jean, particularly since Fraction has possible!Jean here in RED, and I really don't want to see Jean get fucked over again in another "will she or won't she be Dark Phoenix?" storyline. The last time we saw Jean in Endsong, she was back to (or well on her way) being one of the White Phoenixes of the Crown at the end. Leave her there until a better writer can get a handle on how to use her.
So, who's taking bets that Fraction's gonna write another scene of Emma being totally catty to Jean?