The thing is, are the original characters really back?

Aurora/Jeanne-Marie: discounting the yellow/blue eyes of volume 4, the 2006 All-New Official Handbook of the Marvel Universe describes Aurora as a "terrorist", first and foremost. It also states her identity as "Secret", although the short, concise entry in the 2010 Heroic Age: Heroes says "identity public."

The two members of (original) Alpha Flight who really shouldn't have their identities public are Jeanne-Marie/Aurora (who is portrayed more as a victim than a superhero) and Heather McNeil Hudson (who comes from a large family).