Minecraft wiki entry for Development_versions, associated text: The attack timer is now unaffected by switching items, only resetting when the player actually performs an attack.
Critical attacks will now trigger at 100% attack timer charge.
Sprint-knockback attacks will now trigger at 100% attack timer charge.
Default attack reach has been decreased from 3 blocks to 2.5 blocks.
Attacking with a 200% charge now adds +1.0 to the attack reach, up from +0.5.