It's the Black Pearl case from Fractal Design, I think the boing logo is photoshopped though, I guess the real machines will just come with the standard case
http://www.fractal-design.com/?view=product&prod=32
danwood, the case is engraved in real life now (not just photoshop). There was one with a boing ball on display at the AmigaZoom event in Switzerland. It looks just like the mockup, except the AmigaOne X1000 logo looks less sticky-onny than it did in the photoshop graphic.