It will be released at the beginning of December 2022. Canon press release: Canon Introduces…
We got some intel from a new source about the Canon EOS M lineup.
The Canon EOS M5 Mark II (all rumors) might be announced later this year, in October 2020. Along with the EOS M5 Mark II, Canon could also announce an EF-M 52mm f/2 STM lens and an EF-M 18-45mm f/2-4 IS STM lens (a new kit lens I guess). The EOS M5 Mark II should have IBIS and 4K video.
The source also shared some bits about the Canon EOS M60, the replacement for the EOS M50, and a EF-M 100-300mm f/5.6-8mm IS STM lens. Both might be announced in 2021.