If you have had any doubt about Heavy Rain. check this thread!

[Zones]

I think the 30 minutes footage shows you how the game plays, and as for story, Cage wants the players to find out themeselves, therefore, I doubt many story elements will be revealed before the release of the game.

If you have loved the old LucasArts' PC story games like Monkey Island, Day of the Tentacle...etc, you will most likely enjoy this one too.

Edit: MotorStrom is one of the best off-road racing game of all time, I recently bought the second one, and it definitely worths every penny.