Both Canon and Nikon lenses are expected to arrive on late 2017. There is a slight possibility that Nikon may announce its lens at Photoplus show but nothing is confirmed yet.
List of Canon and Nikon Lenses Coming in Q3/Q4 of 2017
- PC NIKKOR 19mm f/4E ED tilt shift lens
- AF-S NIKKOR 70–200mm f/2.8E FL ED VR lens
- CANON EF 600MM F/4 DO IS
We have already seen the prototype of Canon 600mmF4 DO IS lens on Canon EXPO in September last year , the DO lenses save space and weight without compromising with image quality.
Also see — Canon 6D Mark II Coming Soon ?