80-100 people gaining citizenship from what I've read, but not sure how reliable is the source (another forum). It also said the backlog was currently about 400 people (but I suspect it has gotten worse with all the new approvals in the last couple of months, so hard to say).
What I know is there has been 3 ceremonies since my approval (including the September one which I'm sure I'm not on the list), and no news from Council. Soon my waiting time from approval to ceremony is going to be longer than from lodgement to approval
Did you not find a sooner date for your test date?