couldn't find exact figures, but given the concrete + foam, I do believe it's pretty high. As for the price, depends where you are in the world, but in the U.S. that would be crazy cheap for a concrete structure, though it's also likely to be quite a bit more expensive here too as you still need the plumbing, electric, etc.
Here's a thread about it on slashdot: 3D-Printed House Constructed On-Site In One Day.