Inhabitat recently featured the R-House by architect Michael Jantzen:

... the oh-so-adaptable R-House. Intended as a vacation home, it is constructed nearly entirely from Accoya, a new ’species’ of sustainably-sourced wood designed for ultra-high performance and class 1 durability. Rotating walls slide around the exterior of the structure to keep sun and wind coming and going in all the right places. The house has both passive and prefab qualities and is built to be configured and assembled on-site.

The designer's website offers numerous images, but no information about size or price.