Going back and reading the posts again...I think the main difference is that I'm thinking of it in terms of existing standards vs another custom Nintendo thing. I think blu's post
quoted here gets at what I'm thinking of:
Granted that doesn't really answer your question but I don't think it's too crazy to think that AMD would know enough about whatever graphics techniques that they could possibly specialize hardware for them (at least in the realm of tesselation and mapping techniques that are already in use). Also just read that other post about Larrabee again, brings up something else I just thought of earlier, I wonder if there's a potential patent/IP minefield when it comes to this stuff. And if nothing else there's this part of the quote:
I guess they could load up heavily on those units vs whatever a usual GPU would have balance wise, like maybe a powerhouse at texture sampling (or whatever features) but with relatively weak programmability.