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the platform will just be overall more expensive than HD-DVD and the video quality may not be noticeably better than HD-DVD. it might be better, it might not be better, it depends very much on the quality/efficiency of the encoders that they use... but it's really too early to say, without a side-by-side comparison of the same titles in both formats, isn't it?
According to the specs, both formats will use the same MPEG4 codec, so it really comes down to which one can handle the higher bitrate, which is blu-ray.