We decided to start kind of low level and build blocks and combine them per use case.

Here's our roadmap - https://github.com/projectfluent/fluent/wiki/Roadmap

For 1.0 we're aiming at JavaScript, Rust and Python. But if you look at the issues people are talking about Java, C#, Kotlin etc. ports so Swift sounds like a good candidate as well! It all comes down to use cases.

We're currently finalizing 0.7 release which we hope will be the last one including syntax changes (very, very minor - mostly white space relaxation and normalization), and it will allow us to stabilize our EBNF and parser/serializers which, in turn, will make it easier for ports to be written.

Contributors welcomed :)