I took my Note 7 to Best Buy on Sept 3rd replacing it with a S7 Edge and was told to cone back in 13 days before the 14 day return was up to get the replacement. To their credit they really didnt know what was going on.
Went in today and got my preorder confirm for my replacement, even got the manager to write on my receipt they're waiving any return fees, etc. It was pretty painless.
I read on cnet the CPSC had to approve all new replacement models and 'it could take months'. Any one know anything else about that? Makes me think the 21st isn't overly optimistic.