I heard September was that incorrect? We've not heard really anything since it ended

Yes, Stephen Mulhern tweeted a while ago to say it was returning in September. The most likely date was the first Monday (i.e. 1st) to coincide with schools returning.

However the online TV guides, which currently go out to the week after next (i.e. Mon 22/9 to Fri 26/9), still have Tipping Point on at 4pm with no sign of DoND yet.

If they stick to September then it'll obviously it'll have to be the last week of the month.

TV schedules are now online for the w/b Mon 29/9 and still no sign of DoND, so it won't be returning in September if they're correct.

I think 50 shows from the last filming block have yet to air, so if they want to fit those in before Christmas then a start date of Mon 13/10 would be likely.

According to this from "TV Zone", DoND will return in November.