This video centers on bringing sunlight to interiors and basements of large buildings. Just as the elevator allowed skyscrapers to become taller, an artificial sunlight could allow buildings to be designed differently, with more use of basements and interior rooms lit this way.
I think there's another application: for Scandinavians living through long, dark, cloudy winters. It would be a godsend to flip a switch and have a sunny skylight in the middle of January!
UPDATE: Wired magazine now has a good article on the CoeLux as well.