My reaction to the parity part, where the PS4 version would be held back by the Xbone because of politics, is that I don't think 3rd developers like the fact that Naughty Dog, Polyphony Digital, Guerrilla Games, Santa Monica, and now add Sucker Punch to the mix are getting the spotlight and praise for being the stand outs. It implies that Sony WWS are more talented and have more expertise, and while that may actually be true I have to feel 3rd party devs would like to prove they are better or equal. They will never do that by handcuffing themselves to the Xbone and not fully taking advantage of the PS4.
So it will be interesting to me if developers from 3rd parties will take advantage of the PS4's strengths. The really interesting part will be if some do and then some don't as that would shine an even brighter light on those that don't and even more questions will be raised as to why they didn't.