If you want to use V5 in Poser, you will need to install DAZ|Studio 4. Then all you need to do (after installing V5, obviously) is export the base OBJ file, and then a CR2. From there on, you can load the CR2 into Poser and forget about DS4. The only time you need to go back to DS4 is when you buy new Genesis content, to export a new CR2 with the new morphs.

I don't like using DAZ|Studio, as it has a fugly viewport preview, and it is horrible for rendering, but I love using Genesis in Poser Pro 2012 :)