I don't think it's necessarily misleading. The Cube didn't play DVDs, per se. It played a smaller sized disc, a mini-DVD if you will. Revolution will be using standard DVD9s. Regardless, if you don't have a DVD player by this point, you probably don't want one anyway... so the Revolution having DVD playback is rather moot.
The reason I don't see the hard drive happening is because it is not really used for much. The BEST feature is custom soundtracks, and that was rarely used on the Xbox. Why would you need 20GB on a game system? Are you going to install applications on it? Are you going to download porn? Seriously, you don't need that much space. A flash card would definitely be preferable to me, much like it's used on the PSP. It opens up a world of possibilities, such as easily sharing game saves, importing your own images into your games, etc.
As for hooking up a gamecube controller... I don't think so. More than likely, it'll be wireless much like the Xbox360. Plus, if Nintendo really does plan on reinventing the way we interface with games, it won't be possible to control Revolution games with the GameCube controller... so it'd be pointless to allow for backwards connectivity. I mean, you wouldn't use the NES controller to play SNES games, would you? After seeing how conservative MS was with it's new controller, I'm all the more curious about the new Revolution controller.