This isn't HD on a standard video DVD, this is HD video in AVCHD format stored on DVD-ROM, which is rather different. You won't be able to play these DVDs on a regular DVD player, just on a DVD-data device which supports AVCHD (such as a PC or PlayStation 3 or whatever).
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HDDVD@ AC "on a standard DVD"
This isn't HD on a standard video DVD, this is HD video in AVCHD format stored on DVD-ROM, which is rather different. You won't be able to play these DVDs on a regular DVD player, just on a DVD-data device which supports AVCHD (such as a PC or PlayStation 3 or whatever).