URLs for Gists have been updated to a namespaced format, similar to how repositories are structured on GitHub, enhancing their informativeness and making them easier to find. Previously, Gist URLs appeared as a simple sequence of numbers, but now they include the creator's username, such as "https://gist.github.com/bryanveloso/4244350," with old format URLs automatically redirecting to the new version. This change aims to improve the discoverability of Gists online, allowing users to locate them more efficiently.