We would not be surprised to see Kepler in some form during CES, next week in Las Vegas, at least as a behind-closed-doors presentation for select members of the press and investors.
Sources close to Nvidia and AIB partners are telling us that Kepler is faster than Radeon HD 7970, but of course you would expect them to claim that their upcoming product is better.
Without any doubt, AMD is the first with a successful 28nm launch and it will enjoy some time at the top of the market, at least a couple of months.
We will keep our eyes peeled for any new developments, but it seems we will have to wait a bit before anything even close to official from Nvidia.