You can download the original image here (Scroll down to Media). It's called ipad-pro-draw-colors.jpg and reading carefully it seems to me like the words at the right edge of the screen are music genres Eurobeat, French Pop, Honky Tonk etc., and at the top I see emotions: Angry, Passionate, Happy, Cheerful and so on. My guess is that it's not a real app but Apple's marketing department demanded some colour.