Didn't Sony upload their PS4 announcement Killzone video straight to facebook, someone go find it and see what resolution it is.
https://www.facebook.com/photo.php?v=113171115535029 This is the video. Certainly doesn't look like 1080p. At least not a very high bit rate. Could be a Facebook issue of course with the upload. Youtube kind of sucks too. The video on the console itself might be better.