For now you'll need rust installed, see rustup.
In case you have fresh installation of rustup
you might need to do:
rustup install stable
$ cargo install --git https://github.com/aiken-lang/aiken.git
$ aiken --help
Alternatively nix builds are available via flakes.
For more information please see the user manual.
Aiken defines its roadmap using Github Milestones. The roadmap isn't set in stone, but gives a high-level overview of where the project is headed for.
Want to contribute? See CONTRIBUTING.md to know how.
Note
The name comes from Howard Aiken, an American physicist and a pioneer in computing.