It looks like Apple is not completely dropping all Intel-powered devices this year. The Core i9-10910 iMac with Radeon Pro 5700XT graphics and 65 GB of RAM spotted on the Ashes of the Singularity benchmark may coexist with the M1-powered versions, which could end up priced slightly lower.
https://www.notebookcheck.net/Apple-iMac-with-Intel-Core-i9-10910-CPU-Radeon-Pro-5700-XT-GPU-and-65-GB-RAM-pops-up-in-AotS-benchmark.517293.0.html