Backgrounds
Clarified that Coordinating Direction cannot target self.
Classes
Rogue
Added the ability for Mystic Tricksters to gain Precision Attacks that scale off their spellcasting ability.
Feats
Clarified you can choose a higher level feat if your total character level is equal to or higher than the level of the feat.
Game Rules
Added text explaining which proficiencies you gain as a result of Multiclassing in class descriptions.
Added Multiclassing requirements to class descriptions.
Clarified that Two Weapon Fighting requires the off-hand weapon, and only the off-hand, to be a light weapon. Text added in several places.
Multiclassing
Added Multiclassing rules.
Reformatted the section of class pages that explain which proficiencies characters get at level 1 from their class.
Added a new section that explains how you can multiclass into each class underneath level 1 proficiencies, and what you get as a result. You get everything a level 1 character would except saving throw proficiencies and two skills. Classes which get more than two skills at level 1 grant the extra skills upon multiclassing.
Multiclassing requirements per class are listed in this section. Stat requirements are raised to 14, but the classes that required either strength or dexterity now only require one of the two to be 14 or higher (your choice). Barbarians now require a constitution of 14 for multiclassing.