Be sure to follow the link to the full changelog (https://github.com/clojure/clojure/blob/master/changes.md). In particular, a huge feature that wasn't discussed in detail in this blog post is the new socket server and REPL. In short, you can now get a REPL into any Clojure app by passing a flag on startup. Previously you would have had to manually start a REPL server during app startup.