Canon is still scheduled to release a new firmware update for Canon EOS R5 (Canon Store/B&H/Adorama/Amazon) in November, 2020. While there is no info about upcoming firmware for Canon EOS R6 yet.
Features we can expect for the new firmware of Canon EOS R5:
- Canon Cinema RAW light addition
- C-Log 2 and 3
- 1080p @ 120fps
- Further tweaking of temperature control
- Bug fixes
- Other codecs are being worked on, but may not arrive in time for the November release.