Microsoft is planning to re-categorize Windows 10 as a “Recommended Update” in its Windows Update service next year. Microsoft is not making any major changes to the Windows upgrade process, but you need to think before taking part in the reservation process. Windows 10 will automatically download and initiate the upgrade process depending on your Windows Update system settings. Microsoft has mentioned many times that it wants to get Windows 10 into as many hands as possible to reach its goal of 1 Billion installations. Microsoft’s head of Windows and devices Terry Myerson said, the company will only present the dialog box once to end users.
Source: https://thehackernews.com/2015/10/microsoft-windows-10-upgrade.html