Casinos are just bowing to reality. Years ago when pictures meant bulky film cameras and elaborate flash units it was relatively easy to both spot them and to enforce no picture rule even of your own wins. With the advent of digital cameras and videos it became much harder especially as those proliferated. Then you had digitial cameras which also did video. And now, with most cell phones offering digital and video on par with dedicated units of a few years ago it has become almost impossible to enforce any rules. They still exist if for some reason the casino whishes to enforce a specific circumstance but over all an impossible job.
One thing that will be enforced, however, is if they feel you are taking pics or videos of security arrangements.