That footage was available from other sources on the same night it was aired :/ As Rangers stated, a bit of a let down. Hopefully it's improved when released.
https://twitter.com/#!/repi/status/96654041945350144
Q. Why was the SIGGRAPH talk about the Xbox 360 cancelled?
A: We need to focus on shipping the game, so cancelled 4 siggraph talks. but still have 1 talk about various rend. techniques