Many have assumed that the Nintendo Revolution's DVD playing capability would be modeled after Microsoft's original Xbox, that is unlocking DVD playback via a separately sold dongle. However, IGN references an earlier Nintendo press release citing the use of a "self-contained attachment" to play DVD's. From the release: "Two Disc Formats, One Slot: Instead of a tray, a single, innovative, self-loading media bay will play both 12-centimeter optical discs used for the new system as well as Nintendo GameCube discs. Owners will have the option of equipping a small, self-contained attachment to play movies and other DVD content."
Attachment or not, we say let the DVD be free. Free the DVD, Nintendo. It wants to be free.