A draft of WCAG 2.1 that includes content through the latest CfCs accepted this week has been published. WCAG 2.1 adds new success criteria to expand coverage users of mobile devices, people with cognitive or learning disabilities, and people with low vision. Most success criteria are complete, but some are still under discussion.
According to the timeline, this is meant to be the final draft before entering CR. Messaging about this is available at: Final WCAG 2.1 Working Draft
Understanding content for this draft is available.