BA to BF may not have had many cosmetic differences, and was certainly not as big as the AU to BA change, but under the hood there were some big changes. ZF Tranny. Stability control instead of just Traction and
ABS. The VCT cams went dual-independent instead of always being same-phase. That stuff took some effort and was world-leading for Ford - especially the DiVCT, which is now an integral part of the Ecoboost brand.
FG to FH (I'd still prefer FU - after all, we all thought that the AV Falcon would come after the AU right up until the BA announcement - in fact some of the BA parts hard part codes that started with the letters AV) may not have many changes at all under the hood, but the skin will be quite different. Au to BA cost a cool $500M. Consider FG to FH the cosmetic bit of AU to BA, since this is only a ~$100M spend.
Lukeyson