Android One is the project which is developed by Google. All phones from this project have completely clean Android, without any unnecessary apps or add-ons. Project has been started in 2014 in India, but step by step Google wants to expand Android One to other countries. Definitely in this may help new phone, Xiaomi A1 which probably will be Android One's phone.
Some people found information, that new Xiaomi's phone, Xiaomi A1 received MDG2 codename in tests, and it will be based on Xiaomi Mi5X which was presented in July. Xiaomi A1 will support DualSIM option and phone may have 5,5-inch FullHD display, Qualcomm Snapdragon 625 processor and it's rumored that phone may have unlimited amount of memory dedicated for photos thanks to Google Photos service. It's hard to believe that Xiaomi will make phone without MIUI, but how it turns out - this probably will happen.