Netlify is introducing a more structured approach to declaring redirects and header rules, allowing users to add custom headers and signatures to their proxy redirects. The new format will be stored in the `netlify.toml` file within the repository, making it easier to extend files as these features continue to grow. Users can migrate to the new format using the Netlify playground, which allows them to convert their current redirect and header rules to the new format. This update aims to provide more flexibility and control over redirects and headers in Netlify projects.