I don't know if Genosha is going to be used anytime in the near future, but I would love to see Polaris involved if it is. I think it'd be wonderful to see her working towards building a mutant homeland again.
Though it also depends if anyone picks up the plot thread of Lorna opening a school. I'd much prefer her to do something with a Genosha revival, than being a teacher to the next generation that will never become the next generation.