Went to Xcaret yesterday, first time using the new FM2 card as ID for a local's discount. They were NOT going to accept it, the new card does not have an address on it, it is only proof of Mexican residency, not QRoo. Luckily I had a business card on me from work, with my name and address and they accepted it along with the FM2 card. The manager said that in order to get the disc, foreigners will need to bring the letter from INM that has their address on it. (Pain in the butt if you ask me).