Tesla V100 / Volta GV100 NVENC capabilities

Anybody knows specs of NVENC for GV100 chips?
Number of chips?
Stream session limit?
H.264/HEVC/VP8/VP9 performance?
CUDA 8.0 still supported?
When will https://developer.nvidia.com/video-encode-decode-gpu-support-matrix be updated for Volta?

Thank you for updated matrix! :)

Does Volta series supports B-frames for H265?

Turing architecture does, but Voltas can handle only 0 Bframes