quote Walter,  Bizarre Creations technical director:
http://www.bizarreonline.net/index.php?action=fullnews&showcomments=1&id=37

"According to rumours, Sony's original plan was to ditch the GPU and simply
merge the two - rely on single pixel polygons to do the job of both - the
'micro-polygon tessellation' of RenderMan - but the reality has not quite
appeared... there's always PS4 and the next Xbox.. "