If you're like me and didn't want to wait, it's a dead-simple build if you want to DIY:
cd /usr/local/src
git clone https://github.com/elixir-lang/elixir.git
cd elixir
git checkout v1.3.0
make clean test
PREFIX=/usr/local/elixir-1.3.0 make install
And then add /usr/local/elixir-1.3.0/bin to your $PATH.