According to ZDNet [zdnet.com],
Going forward, as new silicon generations are introduced, they will require the latest Windows platform at that time for support... Windows 10 will be the only supported Windows platform on Intel's upcoming "Kaby Lake" silicon, Qualcomm's upcoming "8996" silicon, and AMD's upcoming "Bristol Ridge" silicon.
The policy will be phased in beginning with systems based on Intel's new 6th-generation CPUs (code-named Skylake), which debuted a few months ago. New consumer-based Skylake devices must run Windows 10 to be supported.
Intel and Microsoft *really* want people to migrate to Windows 10. Lets jusy hope they don't try and lock down UEFI even more.