Newsshooter points out that a new firmware release has dropped for both the R5 and R6. The firmware is currently only on the Canon Japan site. Traditionally, these roll out over the timezones over the course of a day. We expect the Canon USA R5 and R6 pages to have the update later this morning or early afternoon.
The same firmware update put out last week for the R5 is now available for the R6 in a slightly-improved form, the one change being that it also addresses a lately-noticed issue of the RF 100-500 zoom lens losing some image stabilization performance in continuous autofocus. Both firmware updates are called the 1.1.1 version. Previously, the R6 launched with the 1.0 version, and the R5 had been revved to version 1.1.
Camnostic has been running two R5 cameras, one with the 1.0 firmware and the other with the 1.1 firmware to assess differences (finding not much to date). This morning, a 100-500 zoom was mounted to both units, and neither appeared to reproduce an image stabilization fault in continuous autofocus, indicating the problem may be under obscure use case conditions.