From CanonAddict - Canon EOS R6 Mark III is rumored to be announced next year:
"The Canon EOS R6 Mark III will not be released until next year according to leakers on weibo, because Canon wants to use its production capacity to produce more Canon EOS R5 Mark II and Canon EOS R1. The Canon EOS R6 Mark III was previously expected this year, but it has been pushed back and will most likely occur during Q1 of 2025."