The app updates just keep coming. Joining Maps, Translate, and Wallet on the list of updated Google apps today, YouTube got a bump to 5.5.26, an update which brought with it several UI tweaks, and a new icon. Actually, the icon appears to be a mistake. Google has shipped out the Dogfood version of YouTube, meant for internal testing. As such, the updated app has a previously unseen "dogfood" settings screen with a few options related to "ExoPlayer."
Elsewhere, there are considerable UI tweaks that appear to represent a move toward higher information density, and an effort to put things where users will find them more naturally.