The announcement and release date have apparently been pushed back to Q1 of 2022. Originally we were told that an announcement around NAB in October was possible, but it looks like it has been pushed back. I do think Canon would like products announced and shipping within 60 days of the announcement.
What do we know about the Canon EOS R5c?
It's an EOS R5 with active cooling, a slightly different form factor, and more codecs for video recording. The camera will also come with a full-size HDMI port.
Keep in mind that most of the specifications from the Canon EOS R5 will carry over to the Canon EOS R5c.