I saw an interview with Jim online from interbike. He said that he wanted to make a 24" frame that looked like a 20" frame. A nice idea but a 24" frame has bigger wheels so thats why they are usually a different shape! The other thing I found strange was that they had the first frames at the show but they hadnt even built one up yet. He even said that the idea might not work. Seems more like a prototype idea, and maybe a bit early to be selling them?
Still, like mike said, good on them for trying something new. They do look nice.