Again, I would wait to start worrying. There's no point in losing hope before the deadline. If it doesn't happen, I'd imagine a Darden-or-bust case would make for a compelling re-application.
Darden is easily one of my top choices and I'd be elated to attend, but we'll see if I get in. I felt like I had a comfortable interview, but it's extremely difficult to tell how it went. Best of luck to all other round 2 applicants -- I think life has a tendency to sort itself out.