Todd Kopriva has an article on GPU acceleration in After Effects CS6 including CUDA and OpenCL.
- GPU-accelerated ray-traced 3D renderer (CUDA on specific graphics cards)
- Fast Draft mode, Hardware BlitPipe, and GPU acceleration of Cartoon effect (OpenGL with somewhat stringent requirements)
- OpenGL swap buffer (OpenGL with looser requirements)
Looking forward to more speed in AE, even if most still has to be rendered (though with the RAM saving it may need a lot less rendering).