NVIDIA declared last night that they’ll release the new products at 18:00, May 6th.
NVIDIA will have 8GB VRAM for its flagship card GTX 1080. The GDDR5X modules are clocked at 2500 MHz with 10000 MHz effective clock, which means the bandwidth is somewhere around 320 GB/s. The GTX 1080 can also boost up to 1.8 GHz, with base clock around 1.6 GHz.
The latest benchmark shows that GTX 1080 is faster than a typical overclocked GTX 980 Ti (~8700 points) by 10%. The core clock is up to 1080 MHz.
The card will be available on the Grey Method Store after release, nVidia will announce the release tonight at 18:00.