This falls in the category of what some people might term a big, hairy, audacious goal. You can read the initial documentation here: Hyperloop Alpha PDF, and Forbes’ commentary here: Hyperloop Update: Elon Musk Will Start Developing It Himself. You can read about a design that bests the speed records claimed by hyperloop in this article published by Fast Company: How Much Did Hyperloop Lookalike Inspire Elon Musk?
The key insight that Elon Musk gives us in the article by Forbes is: “I’m not trying to make a ton of money on this but I would like to see it come to fruition. I don’t really care much one way or another if I have any economic benefit, but it would be cool to see an alternate form of transport.”