Kepler Nvidia GeForce GTX 780

[neliz]

Isn't that exactly what AMD intends to do with the 7950?

Not from a manufacturing/logistics point of view.
The on-sale date of the 7950 would indicate all this work has been done in the month before it. If NV was shipping any Kepler based cards soon, you'd think people would know & have solid leaks/info since it would need to ship around the same time as the 7950.
Do not underestimate the inertial forces of a Chinese new-year.