Xiaomi Mi A1 had only two colors in India viz. Gold and Black. But after today's midnight, you will have one more color option as Rose Gold. I wonder why Xiaomi did not give this color option earlier as it looks fascinating. However, there are no other changes that you would spot, just another color added to Mi A1.
Also, Xiaomi Mi A1 is currently on Android Nougat v7.1.1. Being an Android one smartphone, it is disheartening to see such things but still, let's hope this december would be good for Xiaomi Mi A1 users.