There will undoubtably be a Mac Studio (and Mac Pro?) bump to M4 at some point. Benchmarks [0] reflect how memory bandwidth and core count [1] compare to processor improvements. Granted, ymmv to your workload.

0. https://www.macstadium.com/blog/m4-mac-mini-review

1. https://www.apple.com/mac/compare/?modelList=Mac-mini-M4,Mac...