No, there hasn't been any change on this front lately. They've been tinkering with the various thresholds since the initial release last October, but the overall theme has remained the same: you can take your hands off the wheel for long stretches as long as the car is confident of its own ability, and once the car loses confidence beyond a certain point it will ask you to "reassure" it by holding the wheel.

There was a period for a few months where part of that algorithm seemed to include a timer, such that the car would always lose confidence after 3-5 minutes hands-free. But that was long before the current media fluff, and they changed it back to be more dynamic.