Windows 10 upgrade will be free for Windows 7 and 8 users.
Windows 10 is likely to be release later in 2015, it will be a free upgrade within the first year for Windows 7 and Windows 8 users. There is some confusion about the pricing, some people think they may move to a subscription model, some think it will stay as an outright purchase.
Time flies….Windows 7 was release in July 2009!