Not that I'm cynical you understand, but compare the statements about the 2B software with the official report
I linked to here on 17th Feb. And whats the performance loss with the interim fix?.....
Late Software Not Expected To Jeopardize U.S. Marine Corps F-35 IOC
The Joint Strike Fighter program now estimates a 4-5 month delay in delivering the aircraft’s fully functional software package and is working to recover that slippage after prioritizing work to support the U.S. Marine Corps initial operational capability (IOC) date of July 1.
The Marine Corps, the first Lockheed Martin F-35 customer slated to declare IOC, is using the 2B software package to stand up its first squadron of aircraft at MCAS Yuma, Arizona. Although the 2B is limited to employing three weapons—the 1,000-lb. GBU-32 Joint Direct Attack Munition, GBU-12 500-lb. Laser-Guided Bomb and Advanced Medium-Range Air-to-Air Missile AIM-120 series—the F-35B will surpass the current capability of the AV-8B Harrier jump jet and F/A-18C twin-engine Hornets, the Marines say.
All of the software testing needed to enable close air support (CAS) operations for the Marines—a primary mission, as the F-35B will support the Marine Air-Ground Task Force—is complete, says Lorraine Martin, F-35 executive vice president for Lockheed Martin. The entire 2B software package was expected to wrap up testing in January, but she says “single-digit” numbers of tests requiring specific conditions have yet to be finished. Completion of those was slated for February.........
USAF Lt. Gen. Christopher Bogdan, the Pentagon’s program executive officer, says the initial remedy is effective for a fault that caused a catastrophic fire in an F-35A’s Pratt & Whitney F135 engine last year, but the program is seeking to improve it. The fix—producing the polyimide engine lining with a “trench” for stators in the third-stage integrally bladed rotor roughly 1/8th of an inch deeper—has been approved for production aircraft, according to Chris Flynn, who served as Pratt’s F135 and F119 vice president during the engine fault investigation. The company aims to deliver the first set of “pre-trenched” stators in February, he says. By the first quarter of 2016, Pratt hopes to have added the fix to all engines in the fleet already fielded. “Hopefully, we don’t have to talk about this that much any more,” he says, acknowledging the engine fire and subsequent fleet grounding cost the program time............