I came across this while I was looking for something else -- it's a short clip from what was a June, 2010, seminar.
The technique in the teaser is a block and biset (foot-drag) takedown.
Maha Guru Plinck, to the left in the b.g., sports his Yul Brynner look.
I haven't heard from Guy Bowring, at Resonant Video, when it will be available or what it will cover and cost, but as a heads-up for Sera fans, there's the link.
Guy doesn't make any real money at this, it's a service for the instructors and students of the art, and there are a couple of vids by Guru Plinck, one on the knife, and another that is a multi-instructor seminar in Las Vegas. If you are lucky enough to train with Guru Plinck, you know how terrific the quality of instruction is; if you can't make it to a seminar, the videos are worth having.