it was almost produced, but the demand wasn't there. The 805 is completely discontinued, so there will be no mare upgrades from CZ-USA, but perhaps an aftermarket guy could putter something up. I know one guy who converted an 805 to 6.5 Grendel, but he's a CZ-USA gunsmith with access to awesome tools and the knowledge needed to do it.
I would wonder what calibers the BREN 2 might come in eventually, and perhaps a nicely worded note to CZ-UB and CZ-USA expressing a desire for a BREN 2 in 300 Blackout. Also, you might suggest a "ban" version with as few "objectionable" features as possible. Get active, too and get that junk stopped! Good luck!