Based on new rules materials from the ongoing One D&D Playtest, the new Player’s Handbook will be a retooling of the existing DnD fifth edition rules and is designed to make the game easier to learn and faster to play. The new PHB will include the 12 standard classes, along with 48 subclasses and 144 character background options. While it will be completely backwards compatible with all existing 5e materials, there are a number of new rules being added, including tweaks to classes, spells, races and the introduction of a new “weapons mastery” system that’s designed to make combat more cinematic.