We’ve known that Windows 8 will be out some time in October for a while now, but Steven Sinofsky just announced in a sales meeting that it would be available to customers on October 26th.
https://gizmodo.com/microsoft-finally-hammers-down-windows-8-release-date-5672038
Upgrading from an older version of Windows will cost $40, while upgrading a brand new computer running Windows 7, bought after June 2, will cost $15.
https://gizmodo.com/upgrading-to-windows-8-will-only-cost-you-40-bucks-5922988
Beyond that, you are looking at a more expensive upgrade. We’ve been playing with Windows 8 in beta for since February, and like it quite a bit. Are all of you ready for a face full of Metro come October? [Windows Steam]
https://gizmodo.com/how-to-get-windows-8-right-now-5889097