Not in general, but for Rust 2018, the edition release, we have https://docs.google.com/spreadsheets/d/188xuIgrzGLCu68UKpRjc... (note the tabs too)

It is, of course, best-effort, and often guestimates, so please don't take it as gospel, but describes what we're trying to do. (There was already one situation where a mistake in the spreadsheet caused someone to be misled about when a feature is going to be available)