Awesome news
though it doesn't sound like "full" video, more aimed at short clips:
"Moment Capture – A long press of the camera button starts 4K-quality video recording at 24 FPS. With each frame at 8.3 megapixels, you can save individual frames as high quality still images."
Although I don't mind as I'm far more likely to be using that.
One obvious downfall though, is that the memory is going to fill up VERY fast.
each frame @8.3mp, (so 3? MB per frame), 24 frames, 72MB per second.... ish.