With the 100$ Premium Rose tier you get all the sets and videos she made during the respective month.
As far as I can tell, the set previews tagged with "new release" have the same content. You'll get everything that's displayed there.
However, you won't receive them immediately upon release. Depending on when in the month you purchase, you'll receive all the sets from the previous month at once after a few days. So if you only want this month's sets, you'll need to purchase starting October 1. Once you receive them, you can either disable the automatic renewal or let it continue.