Ah, this was the most exciting thing for me on PS4 reveal conference (I remember people arguing at length whether it's pre-rendered or not afterwards, until it was confirmed it was not), and not because of how good graphics looked (though that kind of visuals in such game is exactly what I've craved for so long), but because of the whole "we're no heroes, but murdering, backstabbing thieves that came to plunder" feel of the first trailer.
As for PS4K exclusive rumour - I sure hope it's not (though I would understand why would they do it, I remember they lacked power on PS4 to implement all they wanted) - I doubt PS4K alone is something that will anger many people, but having exclusives, especially ones that were supposed to be on PS4, will sure set a lot of them on fire.