https://wccftech.com/macos-big-sur-11-4-final-version-released-includes-podcast-subscriptions-loads-of-bug-fixes/

Mac users can download macOS Big Sur 11.4 final over the air right away. The update includes Podcast subscription support and bug fixes.

At this point, it is fairly obvious that the new updates released today have one thing in common - Podcast subscription support. So, when it comes to macOS Big Sur 11.4, things are not different at all. This update packs the aforementioned update and goes further to fix a lot of bugs.