From the WGT News release on the new driver:
16 Jan 2013
Golfers may also be interested in the real-world Nike Covert Driver.
Last month, a few of us had a chance to hit the real driver, and it's
pretty awesome. In fact, the new sound on WGT when you hit the virtual
driver is the actual sound from us hitting the real driver, at the
Presidio Golf Club driving range in San Francisco.