Did you mean beta 9? . We're currently on beta 8 and I can't see Apple releasing beta 9 AND 10 in the same day.I think that what would make the most sense would be a beta 10 (today?) so they have a few days before the holiday to receive feedback, and then maybe a GA candidate release next week (early in the week- like Tuesday).
I am also expecting that on the 20th, when we are setting up our new phones, we will have a 13.01 release to deal with, followed by 13.1 beta early the next week.