I was reading yesterday that the Unreal Engine is now a free download. looking forward to seeing a bridge from Poser hopefully soon

Already done.  Poser Pro Game Dev exports to Unity, Unreal, and Cry.  Even decimates meshes and bakes multiple texture maps to a single map if you want.

Does the Game Dev version have specific exports for materials into these engines or is it limited to maps?

edit-add: Was looking over fbx file structure and it appears to have some limited support for materials. Mostly specular, if I'm reading it right.