It seemed like a foregone conclusion that Nvidia's GeForce GTX 660 Ti would be based on the GPU maker's 28nm Kepler architecture, and lest there was any lingering doubt, a Swedish overclocking site got its hands on a spec sheet that seemingly confirms as much. If the information is correct, the GTX 660 Ti is essentially a GTX 670 card with a narrower memory bus (192-bit versus 256-bit).
Those specs are nearly identical to the GTX 670, save for the TDP, which is 20W lower on the GTX 660 Ti. Memory bandwidth is also lower as a result of the narrowed bus width, which drops from 192.2GB/s (GTX 670) to 144.19GB/s (GTX 660 Ti).
According to Sweclockers.com, the reference model doesn't introduce any design deviations. The GTX 660 Ti is a two slot card with a pair of DVI ports, HDMI output, and a DisplayPort. It's powered by two 6-pin PCI-E connectors.
No word yet on price, though the release date is said to be August 16, 2012.