I wonder if there're any plans to make it self-hosting. It would be more appealing if it can run in browsers and node like CoffeeScript.
If the average IQ of the world population is higher, I think Haskell will become a widely-used language. Haskell is a language much more than its syntax, and takes a lot of effort to learn.
It would even be quite cool to make a REPL and development environment, but that's a little far off.
The Fay compiler is written in Haskell,
so you will need the Haskell platform
installed (or at least Cabal).
I don't know if it is a Fay-compatible subset of Haskell, but I would not bet on it :)