Restort fee
I had a points stay this past weekend and like others have noted, my reservation originally showed no fees of any kind, then a resort fee appeared and then subsequently disappeared.
I can report that this weekend there was no mention of a resort fee at any point. I don't have a copy of my folio yet, although it was supposed to be emailed, but I checked out in person and it was mentioned that the stay was entirely covered by the points.
I did notice some recent changes though, which I could see being things that would be covered by a resort fee - there are yoga/pilates classes in the morning advertised in the room (with no mention of a fee) and car service in the evening - I used it to go for dinner and my only expense was the tip, I suspect that this will be quite popular and so difficult to take advantage of though.
A few days before the stay my credit card was charged over $500 which actually posted rather than just being pending - the hotel explained it was a Marriott mix up that caused some points reservations to be billed and the pushed through a refund, which has also posted, so not a big deal, but it did seem like the refund was done manually because I pointed it out rather than an automatic correction of the the mistake, so worth double checking your statements.