Autodesk is launching soon the beta program for its DWF Viewer v5, which views, navigates, and prints 3D DWF models.
The new release also enhances viewing and printing rich design data published to DWF. Pre-registration for is required at the Autodesk eBeta page (scroll down to "Autodesk DWF Viewer 5 Beta).
Unlike DWF Viewer 4, you can install both DWF Composer and DWF Viewer 5 on the same computer. When both are installed, Composer is the default viewer for 2D DWFs and Viewer for 3D DWFs -- regardless of which application was installed last. You can open 2D DWf files in the DWF Viewer using its File | Open command.