Well, the new Xbox Music is here to stay, it isn't gonna change that much because as you see in thier "future assigments" you dont see much complete rework beside that Transpent tile, or even the faster loading / background loading of music.
the General UI not gonna change that much, same about functionallity, its sad to say this.
I liked the old Music Hub verymuch, was very comfortable to see the "on hold" music and "recent listened to" and "recent added" and all...
Oh, and the sad thing that the drastic change [and probably the reason] of the new Music app, is that now it works with the Xbox Music Cloud. why is it sad? because there are a lot of places, including mine, that probably would never have a Xbox Services support. so there is no reason for me to Tick the box of the "Show Streaming Media" option in settings, cause, I can get none, and it always trying to sync my music playlist with the current metadata and stuff, I dont know why it takes time to load and sync, it have no cloud support anyway.