Black laminate flooring is very attractive, but you will have to keep up with some basic maintenance to keep it from fading. Any room with a lot of light will cause the floor to fade over time. To keep this from happening, you will need to regularly clean the floor to keep it free from debris. Ground-in dirt and sand can also cause the flooring to fade.
There are solutions made specifically to restore black laminate flooring in the event your floor does fade. Look for them at a flooring center or home improvement store and apply as instructed to restore the luster.