http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.77
Cycles Rendering
Improved Subsurface Scattering, and faster SSS on GPUs.
Smoke/Fire and Point Density support on GPU.
Customizable motion blur position, support for rolling shutter.
Custom baking passes.
Performance optimizations for large node shaders.
Improved default settings.