According to SAR, Sony will announce a new full frame Pro mirrorless camera in late January or early February, 2015. The name of this new camera hasn’t confirmed, it will probably called Sony Alpha A9.
Sony Alpha A9 will not replace current Sony Alpha A7 series. The price of Sony Alpha A9 will cost more than A7 series. It will have fastest AF speed in current Sony mirrorless cameras.
When Sony A9 announced, Sony A7S will get a small price drop.
Read More: Sony Alpha Rumors