With the biggest enticement of upgrading from Windows 8 to 8.1 being the return of the ill-fated start button, Microsoft has released the upgrade version of software. Navigating to the Windows page will get you to the download link. The only way you will get the download link (at this time) is if you are on a machine with Windows 8 installed. Otherwise it will direct you to a page to upgrade.
Upgrades for Windows 8 are free. If you have Windows 7 or earlier you will have to pay $119.99 for the update. If you want to switch from Home editions to Professional ediction, that will cost $199.99
Of course, 8.1 will also have ability to connect with XBox 360 (and XBox One when released), Skype, file access from anywhere and many more features.
Windows 8.1 also drops us deeper in the rabbit’s hole to a unified OS and forcing us to use the Metro screen more. My biggest gripe on this is programs like Skype, which lost a lot of functionality when the Metro screen upgrade came out.
Windows also took out media center. While I was promised a free upgrade back in Windows 8 (and never got it), the service is now separate from Microsoft and will cost you $99.99 to get it.