Sony A7S II Check on Amazon was announced on Sep 2015 and the camera is overdue for an update. According to latest rumors coming from SAR website Sony A7S III is expected to arrive in Mid of May 2018. The camera is said announce during the NAB event this year, but during the NAB event nothing happened.
Take a look at the list of Sony Camera and Lenses coming
1) 24mm f/1.4 GM
2) A7sIII and A6700
3) Maybe a 135mm FE
SO these are rumors right now, stay with us to get latest updates.