Microsoft has now confirmed that DirectX 11.2 will be exclusive to Xbox One and Windows 8.1. The company hasn't provided any technical reasons as to why it is being limited, perhaps its being done to encourage users on Windows 7 and Windows XP to upgrade to the latest version of Windows. Both Windows 8.1 and Xbox One are going to be released later this year, a preview of the former has already been rolled out. Windows 8.1 will be available as a free update for all current Windows 8 users. Xbox One is expected to release this November.
Microsoft has made this exact same move in the past as well.
Ubergizmo , DirectX 11.2 Will Be Exclusive To Windows 8.1 And Xbox One, DirectX 11.2 Will Be Exclusive To Windows 8.1 And Xbox One