Monks and Rogues

Monks and rogues are no longer gimpy, watered-down fighters. Monks get cool ki abilities that are granted by their choice of monastic tradition. Rogues no longer have maneuvers (as fighters and monks still do), but they have maneuver-like abilities called skill tricks. The iconic Sneak Attack feature was fixed (previously it was just a conditional version of the fighter's extra damage ability), but the player's choice of rogue scheme (acrobat, assassin, thief, etc.) might replace Sneak Attack with a different talent, such as the incredibly awesome Assassinate, which is ideal for sniper builds and stealthy back-stabbers. Rogues also get a nifty feature called Ace in the Hole, which allows them to turn an attack roll or failed check or saving throw into a 20. All good stuff.