Yesterdays leak of Halo 3 Beta footage was filled with surprises, so Joystiq watched it about ten times over, frame-by-frame to make sure they got all the juicy stuff so that you wouldn't have to.
To save the strong from spoilers, this post won't contain said juicy stuff but what was left on the cutting room floor. They left the hardcore map analysis of Last Resort (the new name of Zanzibar) out as the most significant changes are obvious to anyone who has run through Zanzibar a few times. The Mongoose ATV scenes also got axed for as exciting as it is to see it sliding along the beach, it didn't do anything unexpected. They're still wondering what's up with the lack of Elite's in multiplayer, but we've still got a few months to go.