Nutating...engine?

Forgive the title, but the title of the original Wired article already stole my proposed title. This is a pretty cool blurb about the possible future of engines. Instead of pistons we can use bent disks! Sounds crazy, and apparently they will work with any fuel source.

Here's the link:
http://blog.wired.com/cars/2008/06/pistons-we-dont.html

Whenever I hear about this kind of technology I always say, "GREAT! Now, when can I buy it?" and then I feel like I never hear from them again. Hopefully this won't be the case with this tech.