So I was just browsing ZDNet when I came across a post by Ed Bott. Turns out that Microsoft, on top of deprecating Internet Explorer 8, 9, and 10, will also end support for the original Windows 8 on that date. To receive security updates, users will need to install the Windows 8.1 update first. Alternatively, if they have Windows 8 Pro, they can exercise their downgrade rights and install Windows 7 Pro. You can also install Windows 10, but I'm sure Microsoft has told you that ad nauseum.
They reason for this is because Windows 8.1 is considered a service pack. Microsoft allows service packs to be delayed for up to 24 months before they stop developing security updates. Once they upgrade to Windows 8.1, they will remain supported until 2018 with “extended” support until 2023. Windows 7 will continue to be supported until 2020.
The vast majority of our readers probably don't care. One or two might have an old laptop that you've never bothered pushing the service pack on, or they work for an enterprise IT firm that will have an annoying week starting Monday.