bmurph,
I have a Mt Whitney permit in the time period you mention, 5/31-6/22, but there has been no indication of cancellation. In fact, on rec.gov one can currently make a reservation for a permit on some of those dates.
Campsites 42,43, and 44 are currently closed in the Family Campground. At campsite 42, what appears to be a spring is flowing quite briskly and floods the campsite. The water crosses the road one takes to get to sites 43 and 44. No occupants at 43 and 44 have made it a good spot to collect firewood!
Jim