I just installed the Beta 3 update to Mojave 10.14.5. I don’t know if Mojave will end here or got to a point 6 version like many of Apple’s previous operating systems. But, I can tell you, all my main workflow Apps work very nicely in this update and it is very fast. These 10.14 updates have not lost any speed at all and as far as I can tell they have gained some. I am looking forward to the 10.15 OS from Apple, but in the meantime, Mojave 10.14 is solid.