I don't know how far in advance the planning goes, if the Maddy appearance to open Hellions already had Inferno in mind, if not then Wells has been name dropping Maddy, focus of the first arc, then mentioned in Arcade arc and then mentioned yet again in Gala issue, that's a lot of mentions in only 12 issues. To me it points more towards Maddy being a part of the team than it does a preview of Inferno 2.0 because the solicits and blurbs I have seen on Inferno 2.0 hasn't made it look like Hellions is a central title in the crossover and I don't know if Maddy has been mentioned at all in any of the other X-books.