Taken from the front page:
Protection, 2P -- Your Judgement ability now also grants a physical absorb shield equal to 30% of the damage it dealt.
Protection, 4P -- Reduces the cooldown of Divine Guardian by 60 sec and increases the radius of its effect by 70 yards.
personally I'll be grabbing that 2p ASAP... as for the 4pc though....myeh, maybe I'll be proved wrong... but that doesn't scream 'AMG MUST HAVE' in the same way that 4pc T12 does. I'll probably grab the two best itemized tier pieces and then get the rest from the offset stuff