Summary of rumours in thread so far:
1.)The first Kepler models will be released in either late February,or late March/early April or June 2011
2.)It will be faster than an HD7970,as fast as an HD7970,slightly slower than an HD7970 or slightly faster than an HD7950
3.)It will be priced around the same level as a lower end GTX570 or higher end GTX560TI or priced higher
4.)It will either have additional hardware for PhysX or not
5.)It will have a higher TDP than an HD7950 or a lower one
6.)Nvidia is not worried about GCN or is worried about GCN
7.)The GPU being released first is meant to be smaller than the Tahiti GPU used in the HD7900 series