Kelerei writes: TechCrunch is reporting that Windows 8.1 will start rolling out on Thursday at 4 a.m. Pacific Daylight Time (that's 11:00 UTC). However, it won't be available to everyone at that time, as the article states: "However, as this is a staged rollout, not everyone will see the code at 4 am Pacific tomorrow. The new operating system will pop up as an update in the Windows Store at various times, depending on your location. All you have to do is have a fine sleep, and when you wake up, the operating system will either be ready for you to snag, or on the way." The upgrade is optional (and free) for existing Windows 8 users, though if one looks at the changes, it's hard to imagine why those already on it wouldn't upgrade.