Which is the most promising, upcoming mobile operating system?
I believe it's Samsung's Tizen, given the total ownership of the overall hardware Samsung controls (<a href="https://www.crazyengineers.com/threads/samsung-tizen-will-be-big-blow-to-android-google-agree-disagree.71712">Samsung Tizen Will Be Big Blow To Android (& Google) - Agree / Disagree?</a>).
If I've missed out on any new, promising operating system (mobile), please add it to the list. Do share your comments below.