Rumors of a GeForceFX 5800 Ultra Cancelation?

chris_oat writes "It seems that nVidia's GeForceFX 5800 Ultra may never see the light of day after months of super-hype and annoying delays. This article on megarad.com suggests that poor manufacturing yields are causing nVidia to rethink plans for its (new?) flagship part. Lack of an "Ultra" type solution from nVidia would leave ATI's Radeon9700 uncontested as the defacto performance part."