Sony Chinese Photographer Qianli Zhang recently posted on weibo that: A new Sony camera with very fast burst rate and very fast auto focus speed will be released in 2017, but not at upcoming CP+ Show in Japan in February.
He also said that this new camera will not be an a7 series full frame mirrorless camera. So this camera could be a77 III A-mount camera, or new APS-C flagship mirrorless camera a6700, or high-end full frame mirrorless camera Sony Alpha a9.
In other word, we may not see new a7 series full frame mirrorless camera in the near future.