braced hinge: it doesn't fold like an AT&T tilt, it has a 3rd rigid piece that sort of makes a triangle. One of the last 2 or 3 scenes of the video shows it. It's translucent/transparent, so you just barely catch a glimpse of it.

Nokia had a similar patent for a tilt screen in late 2007.

Though, looking at the video again, it looks like it might just be a kickstand (I thought it showed it while the screen was still attached to the keyboard, but looking again it shows it while the screen is detached from the keyboard). Though, I also wonder how fragile that will be - detaching the pins from the slide.