Now I know why they've been this fast: The other years you always got to see the presenter, this year you just see the slides and get the audio. So they simply had to join the audio source with the slides. Works fine though and having them earlier is certainly nice.
For the last few years, at least, the 'kickoff' overview videos include the presenters, while most (all?) of the session videos are just the slides and audio.
For several years at least, only the biggest room, Presidio, has had actual video cameras. I think this is the first year that they didn't use the video cameras even in that room, though.
