I'll take a stab: * Concurrency support at the language level. * Immutable data structures becoming the default. Making Clojure (2/2) and Go (1/2) some up-an

I'll take a stab: * Concurrency support at the language level. * Immutable data structures becoming the default. Making Clojure (2/2) and Go (1/2) some up-and-comers. Erlang probably deserves some credit, but I'm not familiar with it.