@Trillnar I actually had a chat with red on the subject so, yes, I know what I'm talking about when I say they are implemented but not released. And this for the reason you so kindly mentioned (the textures need rework), among other things.
As for Unity, I am aware of features of that engine. I am also aware of some games having water being like terrain types (not blocks, actually...) and I am not sure how red will implement this feature in Rising World. But I know JMonkeyEngine too, and I can tell you that voxel water have been discussed for quite some times, now, and most of what I read about that particular subject is that it is not part of the engine yet, so each project need to implement and adapt the technique to their own projects.
Somehow, I find that offensive and misguided as I am telling everyone all the time that I am a developer and that I'm often explaining why this and why that. Do you really think that programmers are egocentric selfish people, or something? I am not the type to start insult nor enter silly fights, but come on! Don't talk about things you clearly have no experience with.