Thanks. Elixir looks interesting. I'm apprehensive about the "runs on Erlang" part though (wary of compiles-to or runs-on languages, unless the "to" or "on" is C).
You should become skeptical of languages that compile to C. I can't get into the details because I don't know them very well, but take a look a pcwalton's comment history for a fairly technical discussion of why it makes a poor compilation target.
Actually Elixir and Erlang are totally interoperable with zero overhead. They both compile to BEAM virtual machine code. That "runs on Erlang" part is a selling point IMO.