It's important to note here that the screen itself hasn't gotten a lot faster. No, the reason that this screen is fast enough that it can play 30 frames-per-second video is that Freescale have a controller chip that is optimized to send data to the screen at a faster rate than before.
I'm not sure I care that much, though. Video on E-ink misses the point. No one will ever really watch video on an E-ink screen - not even when it's in color. They'll use an LCD screen, becuase it will always look better and have better color qualities.
I don't care that Freescale can now do a 30 fps video on E-ink; it's far faster than anything I will need for pretty much any kind of app. In fact, I would have thought that half the value of E-ink was that it could be a static display without an energy cost. Trying to make it show fast video is beside the point.
I think it would be better to spend time to get apps responding faster on an E-ink screen, not just videos. That's going to be the real holdup now that the E-ink screen is so fast.