There are already DX11 games with Geometry 3D. For example Battlefield 3, Bioshock Infinite, Deus Ex HR, F1 2013, F2014 and a few more. More will be added, but this will not be possible for everything.
Thanks for your reply, i didnt realise those games were dx11. Can you maybe add a force geometry mode to the settings so we can try geometry with unsupported games ourselves?