http://videocardz.com/57569/nvidia-grid-to-become-geforce-now
Official site - http://shield.nvidia.com/game-streaming-with-geforce-now
Also
Well, there are rumors that NVIDIA held a ‘secret’ meeting where selected members of the press were briefed about new graphics card based on dual-GM200 processor. So far I have not confirmed this information. Either there were shown a very early engineering sample and it’s still days/weeks before it arrives, or it was not true.