No, its not a Pre-Release, its the normal Version of Dw but with some Special Features for Military Use.
The main feature is the ability to use the DIS-Protocol (Distributed Interactive Simulation). With this protocol its possible to connect this Version with outer Simulator like
Prepar 3D or
VBS3.
Also a build in Database Editor is included in the Version.
I know the 3D Object Converter. I contacted the programmer behind but he was not willing to share his knowledge ^^