I big bit of information is being withheld right now though. We don't exactly know the details behind storm's path. To me that will really show if warrior ends up over powered. Also I think hallowed ground still has a decent advantage over the new holmgang since in holmgang you are still taking damage, you just can't die for 6s. Essentially a healer can ignore a pld when he uses hallowed, but a healer still has to keep an eye on a warrior in holmgang. Another thing is I think PLD has better controlled mitigation, with cool downs that require no wind up, warrior has to wind up and plan ahead for most of their reductions. In short my judgement is still out until I play it.
Oh yeah PLD is still beats warrior on utility too with access to cnj skills, a silence, and the best stun in game.