This is what I'm thinking/hoping. Elon would have serious integrity issues if he shoves an extra $16K battery pack in the bed, and then later puts them where they were always planned for it. That would seriously piss me off.
We ordered the FS. The Tesla reps don't feel the standard vehicle will be available this year. I don't either. We'll be using this as a promotional vehicle. If we get a year of novelty out of it, it'll more than pay for itself. The "beast" looks identical, so there was no advantage for that...
So it's $100K for the foundation series and $120K for the beast. Tough call. If you're going to pay the extra $20K for the FS, I feel you get a lot more bang for the buck with the additional $20K for the beast. So it's a $40K upgrade for the top of the line... mmmmm. If I don't order either...