There's definitely a differentiator, at least. Apparently they've forgotten what happened to the many previous attempts at dual-screen phones and tablets.
Yeah, I forgot about that one, although it's not really primarily "the Surface of Android phones"; it's an experimental form factor that happens to be lumped under the Surface brand because why not.
It's supposed to come out later this year.
There's definitely a differentiator, at least. Apparently they've forgotten what happened to the many previous attempts at dual-screen phones and tablets.