The build number is the date the chinese devs release it, still needs to be translated and tested.
In my opinion not installing over the music app color is crazy-this rom is as good as it gets.
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Might seem crazy to you but thats my personal preference, I don't even use the stock launcher with miui. And if a person cant have it the way they want it they will install something else that does. Some people wont even use a rom no matter how good it is unless the theme they want works with it.
So is the color of the music app changed? Or did you not install yet? I use the lockscreen music player ALOT and don't care for purple.