According to latest rumors, the upcoming Canon EOS R5C will be officially announced in the Q1 of 2022, originally EOS R5C announcement is around NAB in October this year, but it looks like it has been pushed back.
Canon has just registered a new camera code “DS126856” in Russia. This new camera could be an RF mount mirrorless camera. The official announcement could be in next few weeks. Stay tuned for more info.