From what I have read in various sources, there are actually only about two or three sources for AR lowers in the entire country. It appears (if I understood correctly) that almost all the "manufacturers" are either buying and re-branding finished lowers, or are buying forgings or castings from the same two or three sources and just finishing them off.
Any new "manufacturer" would most likely have to be buying its lowers from the same pool of sources, which would probably mean they would have to get in line and wait. Delivery by June appears to me to be extremely unlikely.
I also agree that raising this concern without identifying the company is useless.