I was stoked reading all of that until I came to this:
"However, the option for engine swaps and drivetrain conversions was missing from the pre-release version of the game that I played and likely the final game, which was disappointing."
Yeah, I am NOT happy about that.
I can deal with this cuz I didn't do many engine swaps and only very rarely messed around with drivetrain swaps. I know a lot of people will be pretty disappointed, though. There has to be some concessions, I guess. I'm impressed they're including as many of Forza's customization features as it is.
I'm happy to hear that he said the physics were still good. I'm skeptical that they're 'the same' or 'better' than Forza 4's like he said, but we'll see.