GitHub for Mac has introduced a redesigned Changes tab to streamline the process of reviewing and syncing modifications, allowing users to concentrate on their specific changes. The update simplifies the process of amending a recent commit with an "Undo" button and includes an option to enable automatic syncing after committing. These enhancements are part of a broader vision for the platform, and users with GitHub for Mac already installed will receive the latest version automatically. Feedback is encouraged to improve the experience further.