In a talk with Fudzilla, NVIDIA's PR Representative Ken Brown revealed that next-gen 28nm Kepler is on track to hit production by the end of this year. However, the release of retail SKUs, will only be in 2012, presumably Q1. This roadmap is no surprise and has been rumoured even before Kepler taped out.

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NVIDIA: 28nm Kepler production in Q4 2011, release in 2012