Windows 8 will support DX12

Its not something you will have to worry about until at least xmas of 2015, since there wont be any dx12 games until around then.

As for windows 8, it will depend on if windows 9 is out by then. Microsoft usually try and hold the pc gaming public to ransom by limiting new versions of direct x to their latest os. If thats windows 8 at the time, then yes.
 
No one can answer that question. No one knows when windows 9 will be out and direct x 12 doesnt even have a firm release date. If your happy with win7 I see no reason to buy windows 8. Upgrade when you need it, not before.

Thats my advice, take it or leave it :)
 

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