They cut the size of the vertical stabilizers and the extra strength off of the langing gear, from what I could gather.
They also (on paper) changed the materials in the engine.
Redesigning an engine "after the fact" for mere weight savings strikes me as risky, btw.
Shudder...
The F-35 has got to go.
The AWB Has Expired - Gun Owners Have Won Again For All Americans!