This technology preview allows Civil 3D users to generate AutoCAD solids that represent real-world items such as tunnels, retaining walls, or pavement layers. These can be easily used for: visual analysis and design verification, construction coordination, and expanded model sharing between various project team members. Like many Labs technology previews, this is an English language add-on, but it can be installed on any language version of AutoCAD Civil 3D 2012. The technology preview is starting out as 64-bit only.
Via: The Dirt & Civilwized