Straight from a Dutch person's mouth! Make that apparently a Dutch Microsoft employee. Though, note that we are unable to read this page and are putting a big, fat "RUMOR" sticker on it. Kotakuite Rene was kind enough to translate the meat of it:
Microsoft said that they would only use the HD-DVD play for movies, but it seems like they're also gonna use it for their games. They are gonna pack a normal gamedisc (like we know it now) with a second disc that puts the same game on a HD DVD. This disc contains better quality movies and extra content for the game, content that gamers without a HD-DVD player can download from Xbox Live Marketplace as well, for free! This all was said by a Dutch Microsoft employee on a event for retailers.
We've been hearing about these HD-DVD game rumors for donkey's yonks now, and usually they come via some Taiwanese something. Hearing them sprout from Europe is a first, but most likely, not a last.