Edit to expand a bit: Whenever they get around to it, I'm hoping they're not STL's. STL files are pretty terrible for further processing, and they don't even contain units or scale information. They're meshed approximations of the original geometry. STEP interchange files would be much better.
They could release STL files, for people who are just going to slice and print. They should be scaled in millimeters. The main thing would be to not release JUST STL files. Need files ready for modification, because the main reason people will be printing will be to modify, like the STEP files.
But it's a little early. I'd expect them to release sometime before the first of us are given the opportunity to actually order the truck though.