I know that the base figures for V3 and M3 have been free for sometime, perhaps all of these free releases are due to the fact that new figures will be out soon.

The November issue of 3D World speaks of the imminent realease of V4; with M4 and Girl 2 to follow. These new figures will be "able to benefit from the company's new OptiTex dynamic clothing technology." This technology is able to create clothing that drapes naturally due to it's system based on real-world textile desin technology. " Unlike e frontier's similar Virtual Fashion Basic, released a couple of months ago, OptiTex is said to be capable of creating automatically conforming clothes".

I don't whether OptiTex will be a stand alone product that could create clothes for use in Poser or if it will be a Plugin for Daz Studio. Hopefully it will be the former. 

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches