Is it a commercial plane? Is this a better design in any way than regular engines on the wings?
It is a blended body design. It is a hoax. See similar photo from Popular Science magazine 2003 on wikipedia page: https://en.wikipedia.org/wiki/Blended_wing_body
By Source (WP:NFCC#4), Fair use, https://en.wikipedia.org/w/index.php?curid=37713174
Though the aircraft is not real, it is apparently based on the Boeing X-48B Blended wing body experimental vehicle.
Potential benefits of the aircraft include increased volume for carrying capacity, efficient aerodynamics for reduced fuel burn and possibly significant reductions in noise due to propulsion integration options..