This month's Unearthed Arcana article gives us four new elf subraces to playtest. "After the positive response to the eladrin a couple of months ago in Unearthed Arcana, we decided to explore four more elf subraces: avariel (winged elves), grugach (the wild elves of Greyhawk), sea elves, and shadar-kai (deathly servants of the Raven Queen)."
The latest Unearthed Arcana by WotCs Mearls is up. "Mike Mearls introduces an alternative initiative system, inspired by AD&D and the journey to Lake Geneva, Wisconsin—the birthplace of D&D—for Gary Con 2017. While the initiative rules in fifth edition D&D are great for keeping the action moving and being easy to use at the table, the Greyhawk initiative variant takes a different approach. These rules add complexity, but with the goal of introducing more drama to combat."
The latest Unearthed Arcana from Jeremy Crawford and again featuring guest writer Robert J. Schwalb introduces a number of feats which make you better at skills. Each increases the skill's primary ability score, doubles your proficiency bonus, and gives you a little bonus ability. "This week we introduce new feats to playtest. Each of these feats makes you better at one of the game’s eighteen skills. We invite you to read them, give them a try in play, and let us know what you think in the survey we release in the next installment of Unearthed Arcana."