The DVD-Video spec allows for 24-bit/96KHz stereo PCM. It also allows for DTS 96/24, which is a lossy yet high resolution "in-between" 5.1 format. But of course, DVD could not fit them on movie discs with the video taking up too much room. Apparently the Italian version of Tomb Raider has DTS 96/24, but that's about it!
There are some music discs (like Bjork's albums) with DTS 96/24, and also DAD discs, or HDAD (with a DVD-Audio track on the other side) which have stereo PCM, but it never succeeded in the market. Until people can be proven wrong with blu-ray, they will still believe that CD sound is "perfect".
Blu-ray (and uh...yes...also, um...HD...uh...DVD) is the first format to fit high quality video AND audio. About time.
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