Haswell is a special name for a microprocessor architecture that is being developed as a successor to the Ivy Bridge. Haswell's speed is 10 percent faster than that of Ivy Bridge and it's meant to perform more quickly and effectively in rendering graphics and optimizing power savings. Intel expects to release Haswell in 2013.
Techopedia explains Haswell
Haswell is designed to follow Ivy Bridge architecture, with some modifications. One of its main benefits is better power efficiency management. It is also considerably faster than its predecessor. Haswell therefore increases the battery life of laptops and tablet computers by compartmentalizing states and waking up only those portions that have to be used for processes.