Nintendo's finally dropped the curtain on Miyamoto's "Demo Play" idea for upcoming New Super Mario Bros. Wii and it turns out the option is less of a handholding through the entire game and more of an instructional tool on overcoming those tough spots.
Nintendo of Europe updated its site, saying that while watching the demonstration go down in real time, the player can choose to intervene whenever they wish and take control themselves. We can't imagine the need for this system much in NSMBW, though. We're sure the game tape can be solved through a combination of running, jumping and, uh, running and jumping.