IIRC, David from 47's said that there was issues with the supplier essentially stealing the design which led to sourcing the light being problematic for them. They decided to discontinue it. I believe there was a caveat that it could come back if the issues were ever resolved.
Also, I believe the Klarus X6 is essentially the same light as the ReVo. Don't know if they are the supplier 47's had issues with, or just another vendor selling the same design from the supplier.
I may be remembering all this incorrectly, so take it with a grain of salt.