I created a twitch account on the PS4 today. The PS4 has an area called Playstation Live. It had Ustream and Twitch on the menu. You can watch people streaming to your hearts content, but when you try to text chat with the streamer it says you need a Twitch account. So I clicked it and it took literally 30 seconds. Now apparently, whenever I'm playing a game I only have to press the share button and it will start streaming live. Sounds too easy but I might give it a go later and see. I will set the camera up after Christmas as I don't want the kids to see the Playroom until then. But when I do, the whole world see me in the corner of the screen in full Tourettes mode.
I was watching and chatting with an American guy today playing BF4 and it looked awesome. I don't think the 900 to 1080 will be that noticeable, but you will be mightily impressed with the improvement over GTAV mate. It really does make a tremendous difference to the clarity as opposed to BF3.
And the regulars know I wasn't a huge BF fan before.