Interesting Article on MOTO X phone.

Woodside kept the Moto X phone he said he was carrying in his pocket hidden, but said the device would be able to perform tricks such as launching the camera app if it was removed from a pocket and held up to take a photograph.
Low-power gyroscopes, which sense the angle at which a phone is being held, and accelerometers, which measure its movement, will help the phone guess what its user wants to do next.
"It's more contextually aware," Woodside said. "Imagine when you're in the car. The device will know whether it's on or off, it's travelling at 60 miles an hour, it's going to act differently, so you can interact with it safely."

http://www.guardian.co.uk/technology/2013/may/30/google-moto-x-motorola-smartphone