Hello clmogel..
I too applied to NAU summers-only track. I recently sent a FB message to NAU CSD page regarding admission/rejection emails and this is the response I received from Dr. Murray. I hope this helps a little with the anxiety.
These messages were sent February 22
"I did give you incorrect information. The letters that are being sent now are for the Full Time and Leveler tracks. Unfortunately, you will have to wait a bit longer for the Part Time Summers Track. It looks like those letters won't go out until March 15. My apologies! We do get over 400 applications so it's quite a process to go through all of them. May I recommend dark chocolate? It works wonders for me! By the way, this is Dr. Murray"