Demon's Souls hit Japan today, and there is somebody streaming live footage of them playing the game. Im not sure if it's the same person that did White Knight Chronicles, but it's nice of them to do it.
See the stream here:
That stream doesn't seem to work all the time, so you can also watch videos of of somebody playing with a thief character here:
http://d.hatena.ne.jp/video/niconico/sm6053793
It seems they've fixed the clipping issues from TGS, and it's kind've cool watching the character roll through barrels and such and seeing them break.
Impressions are also rather positive in the Official Demon's Souls thread on neogaf.
I'm becoming more interested in this game than White Knight.