GitHub Updates Blog provides announcements, product updates, and insights into new features and enhancements on the GitHub platform. Developers can stay informed about changes to GitHub's developer tools, collaboration features, and security offerings. With GitHub's commitment to empowering developers and supporting open source communities, the GitHub Updates Blog serves as a resource for staying connected with the latest developments in software development.

GitHub Changelog

GitHub's new Files changed page now includes an Overview button that displays pull request descriptions inline, eliminating the need to switch tabs or scroll. The update also includes performance improvements for faster navigation, with more optimizations planned for the coming weeks. The feature is currently in public preview.

Pull request "Files changed" public preview

It was in public-preview for a while now, it’s not new.
The improvements are not that great actually and it’s clear Github management does not really listens or cares about the community needs.
BTW images diff in “files changed” such tons, and also many times the images don’t even load, not to mention their too small to notice any diff.

Excellent Feature! It separates the issues and pull requests from the main feed in the Dashboard and that is greatly appreciated. I always avoided the Dashboard because it was too cluttered with the feed in the middle and everything else around it, that caused slow loading times. The separation of concerns helps improve page loading speeds greatly.