We’ve written a blog post summarizing the changes in this release: https://crystal-lang.org/2019/12/11/crystal-0.32.0-released.html
The full changelog is here: https://github.com/crystal-lang/crystal/releases/tag/0.32.0
All the usual installation methods still apply: https://crystal-lang.org/install/ (but the installation pages are new!)
Docker images (now based on bionic) and 64 bits Linux packages are available as usual.
The brew formula PR is in https://github.com/Homebrew/homebrew-core/pull/47747