According to new leaks, the M1 Ultra is just the start of Apple's UltraFusion architecture. The next Mac Pro may not land until the autumn, but it could provide another huge leap over the Apple M1 Ultra in the Mac Studio with the M1 Extreme.
https://www.notebookcheck.net/Apple-Mac-Pro-2022-processor-and-release-details-exposed-as-Extreme-name-expected-by-Apple-analyst.607921.0.html