Jan 14th 4.0.6 PTR Changes:
# Casting Trap Launcher, Distracting Shot, and Scare Beast now cancel Auto Shot when cast. This is to make it easier to crowd control creatures with Auto Shot while moving enabled.
# The PvE hunter 4-piece set bonus has been redesigned. It now reduces the cast time of Steady Shot and Cobra Shot by .2 seconds.
# All PvP 4-piece bonuses have had their flat stat values cut in half. Primary stats are very powerful in Cataclysm, so much so that players were considering using PvP gear in PvE just because of these primary stat bonuses.
# PvP hunter bonus change reverted
Seems like they may not want us using 4p PvP in PvE lol. The new 4p PvE bonus seems quite good, letting us reach the next haste threshold without having to actually get haste.