New

• Viewing Past Contributions
• Zen Writing Mode
• Closing Issues via Commit Comments
• Improvements to Code Search
• View Long-running Pull Requests
• Task Lists
• Create and delete branches
• Restore deleted branches from Pull Requests
• Contributions
• More Transparent Clipboard Buttons
• Issue Autocompletion
• Issue Attachments
• Create files on GitHub
• Delete merged branches from Pull Requests
• Removed Impact Graphs
• Command bar autocompletes stars
• Repository Archives
• Improved speed of configuration runs significantly
• Management Console API
• Repository restore capability
• Support for multiple admin SSH keys
• Search Indexing API
• System preflight checks before upgrades
• Additional export/import utilities for a more complete backup

Bugfixes / Enhancements

• Major overhaul of Admin Tools dashboard.
• Dropped support for IE 7/8.
• Fixed longstanding hostname verification bug.
• Fixed many pull request creation timeout issues.
• Improved performance of file listing on repos.
• Updated ghe-export-mysql so it no longer locks tables.
• New CLI Utilies:
  • ghe-es-status for detecting and fixing common ElasticSearch issues.
  • ghe-es-reindex for reindexing all items in ElasticSearch.
  • ghe-check-disk-usage for finding large files consuming space on the root volume.
• Added better error checking to ghe-user-{promote,demote} and ghe-user-{suspend,unsuspend} utilities.
• Git pull/clone operations will now be logged to the audit.log file.
• Anonymous git pull/clone operations will now log the real ip performing the operation.
• Added a more informative error when the root volume runs out of space while upgrading.
• Renamed the repository admin area to "Settings".
• Updated the process monitoring configuration to help make it more reliable.
• Fixed a bug where a 405 http status code was received if someone was POSTing while maintenance mode was enabled.
• Fixed a bug where installations could get stuck in a bad state if an upgrade failed partway through.
• Added audit logging for site admin and suspension changes for users.
• Added the ability to delete users who are members of orgs (so long as they aren't the sole owner).
• Updated to latest linux-generic-pae kernel. [requires VM reboot to take advantage of upgrade]
• Removed "Page build successful!" notifications for Pages.
• Fixed bug where the incorrect hostname was being used in Test Emails.
• Fixed bug where hitting escape in a commit comment would cause anything written to be lost.

Security

• Fixed a JSON related vulnerability (CVE-2013-0333)

Additional information is available here.