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Well, RS4 builds actually started at 16350. So we know that RTM will be below that build number, probably far below. They also no longer do any fancy build numbers, whatever build is deemed final is the number, no rounding up.
What has been released as rs_prerelease till now just was the same as the rs3_release, only with early access to some UWP updates. But who knows, msft never started the new IP series before the next official was released
I hope the final build will be stable like 16260 (I log in to the desktop in one second). 15063 was not stable enough and when I pressed Shift+F10 to add this build as a second OS, I got Gibberish (It had to be in Hebrew).