Google Fiber is already live in Provo, Utah, but there's no word on when service will begin in Salt Lake City. Google stated:
Salt Lake has more than breathtaking mountain vistas and fantastic ski slopes. It also hosts a booming technology sector, world-renowned universities and a vibrant local culture. We're looking forward to seeing Salt Lake residents use gigabit Internet to spark creative ideas, jumpstart businesses and collaborate in ways they couldn't before.
Besides Provo, Google Fiber is currently live in Kansas City and has started taking sign ups for service in Austin, Texas. In February, Google announced that Google Fiber will expand to four more US metro areas in the southeast: Atlanta, Charlotte, Nashville and Raleigh-Durham. Four more locations in the US (Phoenix, Portland, San Antonio and San Jose) are still under consideration.
Source: Google Fiber