Night of the Meteor, the remake of Maniac Mansion using graphics inspired by it's sequel Day of the Tentacle, has some preview material available.
A trailer for the game in a style parody of classic horror films is now up at YouTube. The game's theme song, a remix of the Maniac Mansion theme in a Day of the Tentacle style, is available to listen to at the Night of the Meteor website.
The game seems to use a longer script than the original game, but it fits the humor of the series well. There's no release date yet, but work on the game is progressing steadily.