Yep, this. Two stories:
1. Last month, I had the rare privilege of being part of a private VIP tour of Universal. Our guide reinforced at both of these rides that loose articles of any kind were no longer allowed, and she even insisted I remove the camera I was wearing (with belt loop and zippered closure) before riding Hulk. (Of course that was no problem, though I had done it in past years with no issues.)
2. About a week later, riding Hulk again my DD and I waited in the loading area while the ride went down for about 10 minutes. I had assumed it was due to impending weather, but a CM loudly announced over the PA system before restarting that the reason for the delay was that someone had put a phone in their unsecured pocket. He stressed that all items such as phones must be in secured pockets using either buttons, zippers, and I think Velcro. That's a bit different than nothing whatsoever in your pockets, so I don't know which is correct but I think the point is the same.