I echo Patti's comments, I don't think anyone can say anything definitive until the ruling actually comes out.

My understanding of the regs as they currently stand is that passports are the only non-US docs permitted for identification. This is apparently because they are easier to verify (contact a single country instead of dozens of states or provinces within the country), though as we've seen from the Mike18 debacle, passports are far from foolproof.

Also, the exact same passport that is a valid form of ID if you are on foreign soil when you do the shoot is NOT valid ID if that model is in the US. Then, the only valid form of ID is a work visa. Why an ID is valid under one circumstance but not another is beyond me. It's not like 2257 is supposed to be an immigration control law.