At the start of the year, Microsoft announced that operating systems before Windows 10 would not receive support for newer Intel hardware and support for Skylake on said systems would be dropped mid-2017. Yesterday the company decided to extend this grace period to 2018 to provide "greater flexibility".
In a post on TechNet, GM of Windows marketing Jeremy Korst outlined two major changes to its support policy for Windows 7 and 8.1:
To help provide greater flexibility for customers who have longer deployment timeframes to Windows 10, the support period for Windows 7 and Windows 8.1 devices on Skylake systems will be extended by one year: from July 17, 2017 to July 17, 2018.
Also, after July 2018, all critical Windows 7 and Windows 8.1 security updates will be addressed for Skylake systems until extended support ends for Windows 7, January 14, 2020 and Windows 8.1 on January 10, 2023.
Microsoft made these changes after receiving "feedback from customers" — feedback I imagine wasn't amazingly positive. The post goes on to mention these changes should help "customers purchase modern hardware with confidence" during their migration to Windows 10.