When comparing changes to a file using the split view, you can now select and copy just one side of the diff. Previously both sides were copied. Selecting over a comment will still copy the comment's contents.
Submodules defined with relative paths are now clickable in the web UI, making it easy to navigate to linked repositories. Previously, only submodules with absolute URLs were clickable.
Only relative paths following the format ../{repo} (a repository with the same owner) or ../{owner}/{repo} (a repository with a different owner) are supported.
To learn more about submodules, see Working with submodules on the GitHub blog.
In February, we announced a simplified listing process for apps on the marketplace.
All "verified apps" on the marketplace are now updated to the validated publisher model. The listings have moved from the 
verified badge to the marketplace badge indicating the publishers, and not apps, are scrutinized.
Existing subscriptions of the apps are not impacted.
