There were many reports stating that Windows 7 will not be supporting DirectX 12, coming from a video of AMD's Chief Gaming Scientist, Richard Huddy at the PDXLAN event. Richard Huddy stated on the event that Windows 7 will not support DirectX 12.
After that, every major news site spread the word and Windows 7 users were greatly disappointed, as well as websites making articles such as "it's time to upgrade your Windows".
However, AMD has clarified that Richard Huddy 'misspoke' about the topic. AMD issued a statement that says:
There have been reports based on a video of Richard Huddy of AMD making speculative comments around DirectX 12 support on versions of Windows. Richard Huddy does not speak for Microsoft, and he was unfortunately speculating from Microsoft’s publication of key dates and milestones for Windows 7 lifecycle and mainstream support policy. Richard has no special insight into Microsoft’s Windows or DirectX roadmaps. Microsoft is a key, strategic partner for AMD and we’re continuously collaborating with them on DirectX 12.
AMD has not stated whether DirectX 12 will be available for Windows 7 or not, but the statement made by Richard Huddy was misspeaking, and they do not have an insight on such things.
DirectX 12 has been said to be a "low level" graphics API and will include many improvements to existing graphics cards, a well as the Xbox One.
PC gamers who do not like Windows 8 are worried about this and are expressing great demand for DirectX 12's availability for Windows 7.
Microsoft has not made a statement regarding whether DirectX 12 will be supported by Windows 7 or not, but they have confirmed that they are aware of the demand.
Gamers who still use Windows 7 are awaiting an official confirmation from Microsoft on the topic.