Listen & Spot: Rather then roll for EVERY SINGLE THING you may or may not notice you will automatically be considered to take-10 with these skills. You only need to roll when you are actively using another skill or performing an action that requires concentration. OR if taking-10 would not match or beat the difficulty level.
Concentration: This skill is no longer just Constitution based it may also use Intelligence or Wisdom (whichever is highest).
Intimidation: This skill is no longer just Charisma based it may also use Strength (whichever is highest).