SieB
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We are still missing a lot of details, but according to the current schedule it looks like GK110, Nvidia's Kepler high end card, which should up with the Geforce GT 680 brand comes in April.
A chip called GK107, a much slower version of the same 28nm core, will show up in May, while the sexy performance market sweet spot part codenamed GK106 is planned for June. We still have no info when the most affordable part of this gang, codenamed GK108, comes to market.
Mobile parts should follow a different launch dynamic and we expect more than just one card in April. It looks like Nvidia wants to make a name in desktop with high-end parts and that mobile GPUs will have a much wider spectrum, simply because Nvidia has some 300+ design wins in the mobile segment and that they can make nice money off it.
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Looks like we will be waiting a while for some Kelper benches, the mid to high range ones anyway.

Makes the decision of buying a new card harder now not knowing how Kelper will perform and whether to just go with an AM 7000 series card or not. Oh well, more time to save I suppose.
A rumour from Chinese forums Chiphell suggests that NVIDIA has pulled in the release of GeForce GTX 680 from the original plan of March/April to as early as late February.
The rumour claims GTX 680 will offer similar performance to AMD's Radeon HD 7970. Clock speed is 780 MHz - no higher than GTX 580 - while it sports 2GB memory. While this suggests a 512-bit or 256-bit memory bus, NVIDIA has in the past mated 1GB to 192-bit with GTX 550 Ti, so it is possible GTX 680 has a 384-bit memory interface. Little else is revealed about the mysterious GTX 680.
The source of the rumour is notable forum member Napoleon from Chiphell, who has a history of leaking GPU related information. That said, this is nothing but a rumour - amidst other conflicting rumours - and must be considered as such.
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Which gives more credit to the above being true as well.