According to associate NVIDIA Kepler generation do not support DirectX 11.1 at the hardware level.
NVIDIA representative said that the processors Kepler did not support all DirectX 11.1 hardware features, but in these GPU implemented most of the features that will be needed in games. In particular, four functions of the new API were not supported: Target Independent Rasterization (only two-dimensional images), 16xMSAA Rasterization (only two-dimensional images), Orthogonal Line Rendering mode and Unordered Access Views without the use of pixel shaders.
But the potential successors of the GeForce 600 graphics cards will be support of all DirectX 11.1 with no restrictions by the GPU.