From what was said on the playstation blog psxextreme posted a few lines from it, hear is the link http://www.psxextreme.com/ps3-news/3318.html
i searched on google for "in game xmb walthrough" and clicked on "news" and it says it was posted 3 hrs ago, and in the message the guy at the playstation blog said the video will be played at midnight pacific, they say thats in 4 hours from when he posted it... so thats 1 hr left :) i
hope all that makes scence
Respect for compans: SONY > NINTENDO >>>>>>>>>> MICROSOFT