GitHub Enterprise 2.5 introduces features aimed at enhancing scalability, security, and management for development teams, regardless of size. The update includes clustering to efficiently add users in large installations, enhanced caching to manage large data operations, and a preview of the Protected Branches API to ensure safe collaboration. Additionally, the release boasts a refreshed design for repositories and sign-in screens to improve user accessibility and navigation, as well as extended support for Subversion versions 1.8 and 1.9. These updates collectively aim to streamline the user experience and support the growing demands of large development teams.