X-bit Labs writes NVIDIA is said to be working on a third GK110-based card, the Quadro K6000. This new workstation card reportedly features 2496 stream processors (13 SMX) as well as a 320-bit memory bus.
The main advantage of the Quadro K6000 over existing Fermi-based Quadro 6000 and Quadro K5000 will not only be pure performance advantage in professional applications thanks to improved count of stream processors and geometry engines, but 1TFLOPS of double-precision performance (a 100% increase over the 6000 model), which may be appreciated by some professionals.
Keeping in mind positioning of ultra high-end professional graphics card, pricing in the range between $2500 and $4000 should be expected for Quadro K6000.