Good news: F-35 program decreased by $11.5 billion due to efficiency gains with no reduction in quantities.
GAO: http://www.gao.gov/assets/670/662184.pdf
Bad news: F-35 program is still $107 billion more costly than it was in 2001 and includes 409 fewer aircraft.
GAO: http://www.gao.gov/assets/670/662184.pdf
The Air Force isn't the only service procuring major weapon systems without a clear idea of the long term cost of ownership.
... the Navy may go into a critical decision in 2015 about whether to contract for up to 28 more Littoral Combat Ships without enough understanding of the long-term costs, the evolving concepts to sustain the vessels, or even whether they have enough bandwidth to exchange maintenance data with support facilities ashore.