Must have been dev kit 1 then. I assumed it was the best at the time since I was at SIGGRAPH and figured they would have the latest tech. They need to get rid of the pixels and cover your peripheral vision for it to really be immersive. Do you know if 1080x1200 is enough to do that when the screen is so close to your face?
DK2 was released in July, and SIGGRAPH was in August – could have conceivably been either, though probably DK1. I think that peripheral vision is something that you'd just get used to after using it for a while – no one seems particularly bothered about FoV any more. As far as pixel count is concerned, you're not going to be able to render anything decent at a higher resolution with current hardware anyway – the recommended minimum specs already cost about $1000. The latest resolution is pretty great for anything except text, as far as I've heard.