I just got off the phone with Matco today. They claim there is a brand new 850 tire out from desser that is a tubeless version. This NOT the one everyone has been using tubeless. This is a purpose built 22"×850 smooth tubeless tire. its 13lbs so a little more weight than the tubed.

I cant find the link on the website but matco says these are the new ones they're going to be selling over the old tubed. The guy at matco said they must have gone up in the last week.

I'll let you all know how they run.