The launch includes the GTX 680, the successor of GTX 580.
12th March for Editors & 23rd March for consumers.
http://www.fudzilla.com/home/item/26194-nvidia-gtx-680-final-specs-rumoured
&
http://www.fudzilla.com/home/item/26179-kepler-256-bit-faster-in-dx11-games-than-7970

And Intel's Ivy Bridge CPU will be released in April.