I couldn't be more excited about elixir, personally. All the power of erlang plus metaprogramming. To me elixir is the spiritual heir to Ruby
The main loss is a much drearier ecosystem.
If you're going to write a server application, even REST and HTTP, Erlang and Elixir is a superb choice (I would argue better than Ruby with Sinatra, for example) because of the concurrency model and the ability to handle protocols and binary data.
There are also a few nice template libraries for Erlang (for example https://github.com/mojombo/mustache.erl) so if you just need some templating and don't mind writing some glue yourself it could still be a good option.
Key Advantages: * better performance * easier to write services that stay up thanks to OTP * better memory management
The common strength that elixir shares w/ Ruby is that is also very expressive