From the introduction:
This document is part of a series of Unearthed Arcana articles that present material designed for the next version of the Player’s Handbook. The material here uses the rules in the 2014 Player’s Handbook, except where noted.
WHAT’S NEW
Druid. The Druid class and Circle of the Moon subclass are ready for playtesting here.
Paladin. The Paladin class and Oath of Devotion subclass are ready for playtesting here.
Feats. Several revised feats appear here for your feedback, with more revised feats coming in future articles.
Spells. More spells are ready for playtesting, with a focus on smite spells, Find Familiar, and Find Steed.
Rules Glossary. The rules glossary has been updated again and supersedes the glossary in previous Unearthed Arcana articles.