I'm master 650... in that last live stream in the shop in CA there were Diablos later than 650 already there and fully prepped (at least on in the 700s IIRC). A buddy of mine has car 655 and it was in the vid, and I think he's getting it this week but it's a Jefe not a Diablo.
I think there's very little rhyme or reason to the order the cars are actually getting into the shop for PDI. I figure they're all getting loaded into the containers in Vietnam roughly based on the order they're made. But even the order they get built isn't fully sequential (especially when talking about all 3 different models). Then those containers probably get shifted from one laydown yard to another, then eventually loaded onto a boat. During all of that they're basically getting "shuffled." Then the same happens once they hit the docks here. Obviously Speed can't/won't crack every container to make sure they pull the cars into PDI in exactly master-number-sequence... so it's all just down to a roll of the dice when your car gets plucked for PDI.
To be clear ^is all just me speculating, based on no actual data. The closest I have to data was my last pre-delivery configuration call sometime late last year where they projected Feb or March... which may actually prove to be true.
-TJ