There should be change logs for each canary release or if not some website that shows development progress of recent bugs fixed and being fixed in progress and new features in progress. There is a link to their github on the main edge insiders website, but I don't know if that is for the old edge or the new one.
We've been asking for it since the first public release about a month ago. We've got something for the weekly Dev build but not for Canary. Call me Thomas but I doubt Microsoft wants to give us this much information. About three or four of the bugs I reported have been fixed so far but not one of them even received a mention in the Dev Change log.