Is it legal to fly a drone with a go pro or something and take photos and video for commercial purposes?
Yes, many news businesses think so
the numbers of drones licensed for commercial flights by the nation's Civil Aviation Authority (CAA), which regulates the use of unmanned flying aircraft, shoots up -- from 30 in January 2013 to more than 300 today
Many news articles say that the FAA will not really care.
Most drone operators will not care too much what the FAA thinks. This is because the FAA don't have authority over most drone operations. This is mainly because they only really have authority in one country in one part of one continent. The FAA won't be arresting Mr 王 in 中国.
You can read what the FAA says about Unmanned aircraft.
When the FAA discovers apparent unauthorized UAS operations, the agency has a number of enforcement tools available to address these operations, including a verbal warning, a warning letter, and an order to stop the operation.
Which suggests the FAA cares, at least about commercial UAS operations in the northern parts of the continent of America which aren't Canada or Mexico.
They also have a FAQ
All UAS operations for commercial or business purposes are subject to FAA regulation. At a minimum, any such flights require a certified aircraft and a certificated pilot. UAS operations for commercial or business purposes cannot be operated under the special rule for model aircraft found in section 336 of Public Law 112-95.