C35 will be discontinued and replaced by C40 dura ace 9100 wheels. I don't know when that will happen but back in June dcrainmaker said this when talking about dura ace:
Autumn 2016: Mechanical and rim brakes (September/October)
Early 2017: Di2 related pieces
Q1 2017: Hydraulic related pieces
Q1+ 2017: Power meter related pieces, exact timeline still TBD
Where the wheels fit into that schedule or if that schedule is still valid is a good question.