alt Hacker NewsI don't see why? If your video output is plain old RGB (like the Amiga hardware), then an unmodified decoder will handle new files without a problem. You only need a new decoder if your video output can handle more vivid colours than RGB can express.
An image decoded in the wrong colour space for the output will look wrong. It is not using extra bits to express the increased dynamic range: the existing numeric range is stretched and warped.