If they're looking for another 8000 to audition, that would suggest that they've only filled half of the current 10,000 spaces since they were looking for 15,000 to start with.
I was at the hip hop audition which I did not shine at since I'd never done anything dancey before. At our one, they didn't take pics of the full group and there was no mention of finding something else if you didn't get in as a dancer. I left pretty much sure my Olympic dream was over; some of the comments here have revived my hopes slightly but still no email.
I'd guess that the initial 'winners' will get their chance to accept (by 31st) by which point we'll be at 8-9 weeks out from the second auditions. Some of us are likely on a reserve list and they'll wait to see who doesn't commit before emailing those people. And as others have said, it seems that everyone so far is a dancer so perhaps more 'first choice' mails for other roles will go out on Monday. I do seem to recall them saying that there were various sub-directors for different parts of it so perhaps it's just that section 49's was ready to go out and the others are still finalising. I suspect the unsuccessful will be the last to hear - simply because it makes sense to keep your options open until you've got the roles filled, just in case you do need to call on them.
Fingers crossed that a 'win' will still ping into my inbox in the next few days... and into many of yours!