The X-37B

The Daily Mail has an interesting — albeit, overly conspiratorial, perhaps — little article on the X-37B space plane that is preparing to land after orbiting for about a year.

Last May, amateur astronomers were able to detect the orbital pattern of the first X-37B which included flyovers of North Korea, Iraq, Iran, Pakistan and Afghanistan, heightening the suspicion that the vehicle was being used for surveillance.

Is it really being used for surveillance, I wonder? If so, what could it possibly do that existing satellites could not do?