Recently news showed that Xiaomi Mi Note will be officially upgraded to the latest Android 6.0 version. Later news from the Xiaomi Official also showed that MIUI 7 will fully upgraded to Android 6.0 OS, and the upgrade package will gradually push later.
Xiaomi Mi Note
From the photo, we can see that the Xiaomi Mi Note Android 6.0 version is MRA58K. Some users have upgraded to the Android 6.0 Kernel before. With the upgrade of the Develop Version, next version to be upgraded will be the Stable Version. But because a high requirement of the stability, it may be not seen until the Chinese Lunuar Spring Festival has been over.

Source from: http://www.androidmall.co.uk/blog/xiaomi-mi-note-android-6.0-upgrade/