I thought I remember members on here saying ET having another CR special on August 22! If true, maybe, just maybe we will see parts of the trailer if not the entire trailer.
We first saw the DAD second teaser trailer on the 4th or 5th of September on ET. It arrived on the official sight about two days later and a week or so after that in the cinemas.
So, if this ET special thing is correct, I think that it is quit likely that we will get to see it when you suggest or in the next week or so.
The final trailer will be out in October, so they will want to get some mileage out of this second teaser, they will not wont to release it late in September. It will be sooner, not later.