The toolset that many have been waiting for was just released on Autodesk labs. The Interactive Terrain Shaping for AutoCAD Civil 3D. These tools give Civil 3D users the capability to shape and mold various features related to grading, with direct pick, apply, and drag functionality. The Labs site stated that the intent was to "facilitate the development of comprehensive grading plans that can be easily tuned through the development cycle".
A new Ribbon tab is installed in Civil 3D, and contains numerous tools including terrain feature shapes, including: