They won't release One UI2 for M series, it is for their A,Note,S series. They don't even consider M series is their product only. I don't know, they are making this partiality like giving few features only for M series eventhough all the hardware same as A series. For small ex, clipboard functionality is available in A20, but it's not available in M30s. I don't know how its related with hardware. One thing, I heard that M series is online products and that's why its selling on low prices but I don't have any reason for this partiality. May be if anyone from Samsung they can answer. U can feel my frustration from my words.
Give feedback in your samsung members app about the issue , it will be considered and updates will be released accordingly to fix it , Have patience , thank you!
