It hasn't been said what the motion controls will consist of, so to say it will be just iPhone tilt is just as baseless as saying it will be twirling and whirling.
Nintendo's made several motion control games for handhelds, and they all involved tilt. Miyamoto said years ago that he wanted a gyroscope in the original DS. There are now major players in the portable markets with tilt controls.
Yeah, it's not quite "baseless."
a sensor that can read the movements of the player.
That doesn't sound like tilting and if it was tilting, why not just say that instead of being all vague? Unless it was something unique and never done before.
Because it's a Japanese translation, which tends to turn simple phrases like "better graphics" into stuff like, "the quality and definition of the visuals will be of a new standard."