An accelerometer is one of the mandatory sensors that all Ultrabook™ devices must possess. This sensor can detect motion and gravity. Use cases for this sensor are innumerable.
Ultrabook™ devices support more than one screen orientation such as landscape, portrait, face-up, etc.
Current laptops might not be best suited for use under certain circumstances such as in cars or outdoors in direct sunlight as laptop screens usually have some readability and legibility constraint
Ultrabook™ is a growing platform in the industry. As consumer demand fast and lightweight PC, Intel will be pushing brand new devices.