This is the sort of prerelease 5.0. The full version will hopefully come out later tonight. I guess take this time to make sure there are no game breaking bugs. (And I mean stops you from playing at all bugs)
Nope, it's because it takes a long time to create the installers and upload all the files all over the place. I do the patch update first because it is simple, but then next priority is always getting files to Impulse and Steam, etc. We are doing no more quality checks after the patch that you have there, that's the 5.0 version come hell or high water. Doing an official release takes a good 10(ish) man hours, all told.