DuckThor Evil
Legend
It's a GPU that is comparable to GF104/114 in physical terms (size, power envelope) so perhaps you can think of it in whatever terms you thought of GF104/114.
GK 104 is almost 20 % smaller than GF114 and a bit over 10% smaller than GF104 and with the comments from nVidia that they thought Tahiti was faster and the pics of GTX 670 flying around, there is more than enough reason to believe that GK104 wasn't supposed to power a $499 card. I don't think it's reasonable to assume that it would have been a direct replacement for GTX 560 either, but perhaps something to occupy the $299-399 segment?