A couple of floor-standing signs have appeared in front of the Dulles Diamond Lane. They explain the change from "Diamond" to "Special Needs". They don't mention a date for the change. They don't mention any change in the hours of operation of the checkpoint - currently 4AM - 6PM.

They do say explicitly that, after the change, "Any traveler presenting themselves at this checkpoint during normal hours of operation will not be turned away." So that aspect doesn't change at all.