Todd Kopriva at Adobe has posted a document with details on the integration between After Effects and Cinema 4D in the new After Effects. He links to more extensive discussions, and then has extensive details on this.
Damn this makes me want Cinema 4D! I wonder if Autodesk and NewTek are on the horn working with Adobe to add something like the for their programs as this will really make Cinema 4D the number one 3D for ease of use between it and After Effects.