You dont lose agro anymore when you pop the shield, however, the cooldown on forberance (the debuff you get from shielding yourself) has been increased to 3min.

With the new info I'm changed my pally build

Moved 5 points from Kings and put them in Devine strength. With Kings now being a tier1 talent I'd imagine Holy pallys will be picking it up as an extra buff. But, I still dont think Devine Guardian is that great because you shouldn't be losing agro anyway.

Moved points from Imp Judge, Vindication & Crusade and put them into 1h weapon specialization.

I may move the 2 points from Pursuit of Justice and put them into imp judgement as I hear judments will have a warrior thunderclap affect.