The likelihood of the Rust rewrite being announced is grossly overstated, and the PR that just landed almost certainly won't get merged before I finish this comment
If the team were to rewrite the server, I would love to see considerations for reducing the the supply chain surface.
Was recently attempting to build the server in a Yocto recipe which means downloading sources for all dependencies ahead of time. The biggest challenge was the pip dependency and transitive dependency list. Each entry here is not only an additional packaging requirement, but another ongoing obligation to monitor for CVEs.
Would love to see Zulip server as a golang binary.