I don't know if CMHC is doing anything like that. I know there has been talk about improving incentives and funding for rental housing, but I don't know what there is specifically for co-housing, so I can't answer that part of the question.
Any support for these kinds of developments would be most welcome and would be very beneficial to communities. There are opportunities for co-housing and for public-private partnerships. I definitely know of at least one or two local developers who would be interested in working on a co-housing project.