> Instead of Beats Music, the Apple Watch features an unannounced music app with a blue play button (top right in the photo below) that instantly starting playing songs when tapped during a demo.

That's the current-day Remote (for AppleTV) icon in a circle instead of a rounded rect. iTunes' logo is right there in the middle. This lack of research makes me question the rest of the article, honestly. All of the post-Keynote demoes were said to be non-working, so for the touch demoes, it could have just started playing music for the sake of it, regardless of which icon was tapped.