Spent 5 days in the parks last week....
We utilized our fast passes outside of the return times all week. On Friday, the 29th, as we were using our FP for Splash (after the return time), the CM at the head of the FP line, said "it is no problem now, but just know that we have been told we will have to start enforcing return times, but we have not been told the official start date" I talked with her about it after we rode Splash and she said she herself uses FP after the return times and was not happy about it for herself and for the fact that it will not be fun to enforce because she knows it will upset park-goers. Again said there was no confirmed start date but it will be coming. She also stated she thought that they may be enforcing them on RSR now. Not sure of that.
Not trying to start a big debate, just sharing info I received last week...