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Gigan's comments make me feel that we need an all-inclusive fact guide.
The "Freehand", what Nintendo seems to be calling it, is a one handed, wireless device. Incorporating a D-Pad and free form movement controls (as two sensors applied to both sides of the TV can read), there are seven buttons on the device. A seems to be the primary action button, while B is the trigger button. a and b are most likely primarily used in the sideways, NES configuration for classic NES games only. START and SELECT do what they always do, and HOME will probably access a dashboard of sorts. The Freehand has rumble built in, and currently runs on batteries with a lifespan equivalent to the Wavebird, but Nintendo admits they're looking at a charger situation, if feasible. At the bottom of the Freehand is a light indicating what player (1-4) you are, and it has a plug.
Nintendo primarily showed off the Analog Adapter that connects into the plug. With an anlog pad and two buttons (Z1 and Z2, which like everything else, can change), Nintendo will most likely include it in the Revolution package. As this adapter is unnecessary for many potential Revolution games, it'd probably not be sold with additional Freehands to lower costs, and would be presented as a seperate option. While unnanounced by Nintendo, the only other feasible "Adapter" I can figure would be a microphone, as many other traditional controls would be included in the, later described, "Classic Controller Dock". This plug can also enable the Freehand to "dock" into any number of devices, such as DK Bongos or a Dance Dance Revolution Pad, or... as currently being worked on by Nintendo, a Gamecube-esque controller, allowing for multiplatform gaming and retro gaming.
The Revolution, as it is not a multimedia device, but a game console, does not have out-of-box support for movie DVDs, but WILL release a "dongle" (of some sorts) to allow DVDs to be played. Out of the box, it CAN play Revolution discs and GCN discs in it's disc drive, making it one of the few drives that can read multiple size discs.