— Eli Dalton (@KSDrae) April 22, 2018
As described in Sword Coast Adventurer's Guide, sun and moon elves have the racial traits of high elves from the Player's Handbook. You can already play either of those races by choosing high elf.
— D&D Beyond (@DnDBeyond) April 23, 2018
— Jeremy Crawford (@JeremyECrawford) April 23, 2018