The bulb itself will use GE Align technology that is designed to change color for the promotion of better sleep patterns. GE states:

Lighting impacts our sleep patterns, and GE Align tunes the light spectrum to help promote the body's natural sleep cycle by controlling the blue concentration of light output. In the morning, GE Align produces a bright, bluer tone that suppresses the body's production of melatonin, and in the evening it produces an amber light, reminiscent of candlelight and campfires.

The LED light will be able to be controlled by a HomeKit-supported device in both individual bulbs as well as in groups and can be connected to other device as well. GE will launch the new bulb sometime later in 2015 but the company has yet to reveal the design of the light nor its starting price.

Source: GE