Update: YouTube tells us that its current logo “is not going away,” and that these changes are part of an increased use of the play button to represent itself.

The current section your viewing gets a filled-in icon, while YouTube Music’s logo has been updated to the new style. It also applies to iconography in the top-right corner of the page.

Today, YouTube is taking this update out of beta, ... YouTube’s big makeover continues with redesigned mobile app, new logo and more. Sarah Perez. 8:01 AM PDT · August 29, 2017.