Hand Crossbows now do a base 1d4(small) or 1d6 (medium) points of damage
Light Crossbows do a base 1d10 points (small) or 1d12 (medium)
Heavy Crossbows now do a base 2d6 points of damage (small) or 2d8 (medium)
The Double crossbow no longer causes a penalty to hit with it if you are proficient, its base damage is as a light crossbow of it size.
The Rapid Reload feat now allows you to load a new case of bolts into a repeating crossbow as a move action.
The Crossbow Mastery feat now allows you to load a new case of bolts into a repeating crossbow as a free action. If you have multiple attacks, this means you may make your full number of attacks with a full attack when using this weapon.