Thank you 2.
From the looks of the photo, I think it's the lighting and heavily photoshopped image that gives the impression of a triangular tube, hopefully better pics will start making the rounds.
If you compare the interface between the top tube and seat tube /down tube you can see the difference between the World frame X-section and the Classic:
From the r-m website (Spezifikationen) did you note that the Race Disk brakes are the same as those on the Titanium model - ie Avid BB7 mechanicals (not hydro) - there is probably a reason for that. Even these carry a 300g penalty relative to V brakes.