Found this site during lunch where fans get to list there predictions for the Sopranos finale. Some amazing ideas! Personally, there's no way Adrianna is coming back. But this idea has really hit home with me:
Tony and his family go into Witness Protection. The FBI ironically assigns him the name "Kevin Finnerty" - the alter ego he dreams of during his coma in Season 6. His dream was actually a vision of things to come.