Donna, I wouldn't worry. I know everyone is anxious to find their SB but the last few GEs have extended over a couple of days. It's really no biggy. A couple of people signed up through 3 days past the "closing date" and we have 1 so far, which is great!

I would expect that we will get our SBs tomorrow, if we're going considering previous GEs.
As for the deadline being pushed back, I don't think that's a problem. But, really, if you're 2-3 days late past the deadline, I would hope that no one would freak out about it as long as you make a post to your SB

It'll be worth the wait, I'm sure!
Personally, I wouldn't mind pushing the deadline back to, say December 10ish. That way it's closer to Christmas when packages arrive!