Still a beta, I'm sure they'll throw back in the stars. It's such a big part of iTunes.
Also they will probably make adjustments to the font sizes/weight. Used it for a bit and I got over the big fonts but they can definitely be smaller. Like the way they've organized it. For a bit I wasn't sure if it was actually an improvement but I think it's because I spent a year getting used to how the iOS9 app works.
The black/white interface seems to be a precursor for a dark mode next year which I'll welcome.
I wouldn't be so sure about that. One of the common criticisms was that the UI was confusing, and having two different ways of rating songs (stars/likes) contributed to that confusion.
I can see them keeping it in iTunes on Desktop, but I'd think they are probably gone for good from the Music app.