Per this GPS World article, Lockheed Martin has been awarded two Air Force contracts for four more next-generation GPS-III satellites. Lockheed is currently under contract for production of the first four GPS-IIIs, which will replace aging GPS satellites while at the same time improving capabilities of the system. The Air Force plans to purchase up to 32 GPS-III satellites.
And for you serious GPS fans out there, you can now have your very own GPS satellite! Well… almost… it isn't space-worthy, and doesn't produce any signals, and it's made of Legos… but it's all yours for only $47.50! See more at Space Satellite Models.

