Sometimes it takes a while
I interviewed 4 months ago with the regional I wanted to get in with the most. Everything went well (they even told me that at the end of every phase) but the phone didn't ring for 2 1/2 weeks. Then it did with a class date 15 days later!
Long story short, I was the first person interviewed and hired for this class but the last to get a phone call for some reason. Others that were "mass interviewed" got thumbs up or down that day. There really wasn't any reason except that the HR lady was swamped, or so I'm told.
The moral of the story from me; don't give up hope if the phone doesn't ring right away. But I know, it can be worse than waiting for an upcoming interview!
Good luck!