What 8.1 does currently is says, "Windows is restarting in 1 day", then 1 day later if you haven't restarted (for a lot of people, that's plausible) it restarts

What 8.1 does currently is says, "Windows is restarting in 1 day", then 1 day later if you haven't restarted (for a lot of people, that's plausible) it restarts for you, regardless if what you're doing. There is a way to stop it, but you need to literally kill the Windows service, which is annoying. And that's on Enterprise.