It was bound to happen. YouTube is joining the fray of other Google apps to get the Material Design treatment. Not much has changed when it comes to functionality though. What we get is a new red design on top for the homepages main colour but it also pulls colours from individual channels so when you visit one it pulls colors from the page. The update should be coming to your device soon. Just wait for a bit.
Source: Gizmodo | Download: Google Play Store (Free)