THE ADJUSTMENT
They may be waiting to see how many UNITS from May that they can skim off the top and slide back into April, so April won't look as Terrible as it really is. They will probably try to split the difference between the two months.
They can't afford to show a Terrible month for April. So they might "Cook The Books", showing two Flat months. Instead of a Terrible April, and a Flat May.
They have never really skipped a month before. So Something Is Up. And I would not doubt that they are going to do a little "Adjustment" in their little disclosure routine, to try and smooth out some Terrible monthly results.
Otherwise, they would have released the April results on Friday afternoon.
BUT WAIT - THERE'S MORE
Another thing that they might be doing instead, is to "Combine" both April & May. They may be hoping that this would dilute the results enough to prevent the more accurate reading on how bad things are really going, month by month.
By mixing the two months together, they might hope to hide the actual per month results, hopefully keeping the pps from . . .
I M P L O D I N G
JMO