Elario's right. It will be capable of outputting native 4K. You see receiver's from Onkyo that can already output a 4K signal upscaled from 1080P, do you really think a processing powerhouse like the PS4 won't be able to do that? Just like 1080P gaming, it will be a selling point, but irrelevant. Let's face it, most people have no idea that COD is at less than 720p, they think it's HD. It will be capable of outputting games at 4K, but the reality is that none of the serious games will actually be at 4K, instead most of the games should finally be playable at 1080p/60. None of the publishers are going to waste the resources to develop games at 4K for all of the 4 people that will have a 4K display in the next 4 years. It will provide upscaling to 4K for Blu-rays, just like new receivers and BD players too. To assume they won't go after the low-hanging fruit to have more feature boxes to check off is just silly. They have the processing power, and features sell hardware, even if people never use them, it's just the way things are. Sony is already offering Blu-ray players with 4k upscaling, and from a June 6th Sony announcement:
Molyneux said he could not yet reveal Sony's plans for bringing native 4K content to consumers or say what method of delivery (optical disc, streaming video, multichannel video distribution) would likely be employed.
But, he added, "I don't think we are looking at a very lengthy horizon" before such announcements are made.
"Sony is leading the 4K revolution. We are pushing it forward," Molyneux said. "We are committed to that direction, and that is part of the reason we are educating the industry around content capturing, management and playback."
It won't be a feature that will matter to me, but to think that the PS4 won't do 4K is illogical and amounts to less than conjecture.