In an interview with ASCII.jp, Canon executive Yagi Koichi had this to say about the immediate future of the EOS M line (Google translated).
“in the third quarter and fourth quarter of 2015, we have been able to ship a lot of mirror-less the number of cameras, not yet satisfied by For. At present new products, but mention can not be, the third quarter in 2016, towards the fourth quarter and that the “mirror-less market is forecast to grow, Canon’s share of the” mirror-less camera market and two years ago the 4-position, we want to aim at the 3-position.
My summary of the above quote:
We’re working on new mirrorless products that we plan to launch in Q3 and Q4 of 2016, we obviously can’t discuss those products at this time. We’re currently #4 in mirrorless, and want to get to #3 in marketshare in the near future. We do expect the mirrorless market to continue to grow and we want to be a part of that growth, but we need to produce better mirrorless cameras.
So it sounds like Canon has plans for a big splash in mirrorless for Photokina 2016 in Cologne, Germany.