Nissan has announced the Coupe Micra Cup will continue until at least 2020:

Joni Paiva, president of Nissan Canada Inc., announced that Nissan Canada and JD Promotion & Compétition have extended the Nissan Micra Cup contract for three more years, with races to occur in both Ontario and Quebec once again.
Aside from that announcement, nothing new was added, though details about the 2018 Nissan Micra Cup series will come out in the winter.