Even more exciting, this is already present in go1.13. I believe the author of these slides made a mistake.

Here it is mentioned in go1.13 release notes: https://golang.org/doc/go1.13#compiler

And GitHub says the commit is present in go1.13: https://github.com/golang/go/commit/996a687ebbf81b26f81b41b8...

Yeah it is slightly misleading. The escape analysis rewrite was done in 1.13. But work is now going on to remove the old escape analysis code.

Yeah, useful for teams that want to use pointers everywhere and disregard escape analysis xD

Does it offer any user visible improvements or is it only a compiler internal improvement?

It might lead to fewer allocations in complex programs, as the compiler is able to put more in the stack under some edge cases.