WDW just telephoned me and I spoke with a really attentive and responsive CM for over 10 minutes.
Here's the gist of what she said:
(1) They are now checking guest rooms once a day. So if you turned down housekeeping, someone else will want access to your room at some point. You can arrange for the time they're going to come by calling the front desk and letting them know.
(2) If housekeeping hasn't serviced your room yet (like while you're out at a park) and you come back and want to take a nap and not be disturbed, you can call the front desk and let them know not to disturb you and they'll honor your request. However, at some point you will have to give access to someone to come into the room.
(3) If you got housekeeping and they cleaned your room that day, no one else will come to your room for any additional inspection, etc.
Since we always have housekeeping, this seems like it's not an issue for us, however, I see how it is if you've turned down housekeeping or are staying at a villa on points.
The CM actually said that one of the reasons this policy went into effect is that with the option to turn down housekeeping at certain resorts, the housekeeping staff would show up in the room after a couple of days of no service and the room would be trashed or there would be problems, like a leaky sink, for example, that hadn't been addressed for those couple of days.
I hope this is helpful to others on this thread. I can only report what the CM told me. I haven't been there since the new policy went into effect, but I hope this information is correct. I will report back after our trip.