When you’re signed in, YouTube’s homepage now has a carousel interface similar to the new design for channels. The “what to watch” section groups recent videos from your subscriptions, recommended videos and now also shows popular videos from some of your subscriptions. For music artists, YouTube links to a playlists that includes their top tracks.
The new interface is more compact, it shows more videos, you can easily ignore recommendations and prolific channels can’t “spam” your homepage. Unfortunately, you can no longer remove videos from the homepage, quickly unsubscribe from channels or see the videos you’ve previously watched. These features are only available in the “my subscriptions” page, which still has the old interface.