Here are the new features that will be coming to Direct3D 11:

-The introduction of Tiled Resources, a new hardware feature for efficiently managing enormous volumes of data on the GPU more efficiently, enabling unprecedented levels of detail as well as more immersive open-world gameplay without making gamers sit through annoying "level loads".
-Excellent tools in Visual Studio for analyzing and debugging code built using Direct3D 11
-Improved performance when accessing memory shared between CPU and GPU when executing compute workloads.
-Programming model improvements, including advances in HLSL that enables developers to write more manageable shader code, and reduce runtime cycles spent on shader compilation.
-Improved performance and efficiency on mobile form factors by reducing presentation overhead and enabling hardware accelerated overlays & scalers. This enables better game performance on high-resolution displays, and improved rendering latency.