Finally! The DirectX 11 patch for Crysis 2 has been announced by "CryTom" on the MyCrysis forums posted about the patch today saying:
We would like to announce that there will be a DX11 patch released for Crysis 2. We are working to get the best out of DX11, so we'll wait to announce the features until a little closer to release.
There's no exact date but at least we know it's coming now, direct from the horses mouth.