He's open sourcing it, but he's changed his mind about not building it and does plan to build a demonstrator. Announced that in a teleconference this afternoon.
Will this be a US only thing, or will the technology be adapted for global use ?
In the PDF he addresses overcoming the Kantrowitz Limit, the speed limit imposed on a pod in a tube by the trapped column of air ahead of it. His solution: divert it with an electric fan, not unlike a high-bypass turbofan engine and with some of it being used to levitate the pod.
Guess this will slightly delay his other idea: an electric passenger / cargo "jet."