Digicame-Info who aggregates rumors and information and typically has reliable information has mentioned today that the RF 800mm and RF 1200mm have been added to overseas dealers lists recently. This usually means that the lenses are very close to becoming available.
These lenses have been on our roadmap for quite some time.
According to Digicame-info;
There are rumors that Canon will announce the “RF 800mm F5.6 L IS USM” and “RF 1200mm F8 L IS USM” in the near future.
- Canon “RF 800mm F5.6 L IS USM” and “RF 1200mm F8 L IS USM” added to overseas dealers
Keep in mind, that this is the “usual” announcement period leading up to CP+ for Canon so new product announcements wouldn't be that much of a surprise right now either. Of course, we have had these two lenses on our roadmap for what seems like forever. (November 2020)
Digicame-info, notably did not quote and link the source of this rumor, something that gives me a bit of pause because they are very good at linking back reliable sources. That's not to say that this rumor is incorrect, just that it's a curious decision on their part.
The image shown is one of the Canon EF 800mm F5.6L