As far as I can tell, White House, CDC, FDA, releases a "Six Page Addendum" to the national testing plan on June 5, 2020.
Find it here:
I've also put a cloud copy here.
Frankly, as a six page guidance document in fairly large font, it doesn't say a lot, but it's worth tracking. The feds note that pooled samples may be used for community/workplace health purposes, and they discuss potential use of large scale testing by colleges and universities ("research testing capacity [can] support surveillance testing on campus.")
See also the newest article by Scott Gottlieb and Lauren Silvis, in WSJ on June 7 - here. The subheadline? "Companies can deploy tools like pooling samples to detect outbreaks."