We also rewrote how we composite ambient occlusion to lighting, the ambient occlusion component will properly react correctly to the rest of the pipeline, including specular occlusion.
We're also moving our default technique to Ground Truth Ambient Occlusion which gives very high quality AO, it's still fast and it kicks ass. Ambient Occlusion also composites properly with MSAA, this keeps thing sharp without aliasing. With how this works now you can also add your own ambient occlusion techniques modularly to the pipeline without much difficulty.
