We released pa11y-6.0.0-alpha which has preliminary support for some of the new WCAG 2.1 rules
It seems to be working fine as far as I can tell, but some work is still required in order to assign the rules to the appropriate set and allow people to select between WCAG 2.0/2.1 A/AA/AAA
Once that work has been released, we need to update Dashboard so we can make those selections here too.
Jose says about Pa11y core:
Once that work has been released, we need to update Dashboard so we can make those selections here too.