Minecraft wiki entry for Development_versions, associated text: Can now charge a ranged attack when the player is building high, hiding behind walls or being out of range of their melee attack.
Their rib cages will open up to shriek a sonically charged ranged attack that can penetrate walls.
The ranged attack deals 30 × 15 damage in Normal and can hit at a horizontal distance of 15 blocks.
The ranged attack can only hit one target at a time.
Can now smell players from further away.
The vertical range wardens get angry at a target while sniffing is now 20 blocks instead of 6 blocks.