Hi Denis Pokotylyuk, I can't give any promises, but we are currently working on this and want to have clustering in some form by 4.14 (I.e., at feature parity with 3x). There have been some exciting server/service advancements that we want to leverage in 4.x where we can. In fact, I just got out of a meeting on this very topic.
By the way, if there's anything new you'd like to see in terms of clustering, please let us know!