As reported here and here. As noted on rabble.ca, the law was passed last year, and no trans passengers have reported any problems at this time, but full implementation of new laws can take a while. And while there do appear to be medical exemptions which would theoretically include transgender individuals, well, again, Mercedes Allen points out several of the problems with the medical exemptions in her rabble.ca article.
It’s worth noting that Canada as a whole has yet to pass comprehensive equal rights legislation which is inclusive of trans people. Such a bill was passed by Parliament, but failed in the Senate. Needless to say, this is very alarming, and my heart goes out to my trans brothers in sisters in Canada, as well as anyone traveling into or through the country. Traveling while trans is hard enough without this bull.