Miyamoto: Tough to Use 3DS Gyro Controls With 3D Output
You probably shouldn't be tilting your 3DS around in public anyway...
Were you hoping to play Mario Kart 3DS in 3D using tilt controls? If you've had the chance to play the 3DS at trade shows, you'll probably know that this doesn't seem likely, as the system's 3D effect is difficult to view from odd angles.
Nintendo's Shigeru Miyamoto has commented on the issue in the latest issue of Nintendo Dream. As reported at Game Memo, Miyamoto told the monthly magazine that it would be difficult to combine 3D output with tilt-based controls in a race game, as tilting the system makes the 3D effect disappear.
The Game Memo writer notes that this probably isn't a problem with the 3DS hardware itself. That is, the system is capable of outputting 3D while detecting motion through its gyro sensors. However, the two technologies may not be compatible for something that requires precise controls, like a race game.
Of course, there's always the possibility of just turning off the 3D effect, so there's still hope for a motion controlled portable Mario Kart (with a steering wheel attachment to make you really looks nuts).