I don't think that modelling V4 after a specific person is such a good thing. One of the better things about the previous Vickys, was that it was the morphs used on the (neutral) base figure that made it useable for different characters. The standard Poser figures already look like a specific persons face, but are not as versatile as a result of this. If you just want a figure to use out of the box, then this is fine. Milla is a very sexy woman, but people's pictures are going to become "samey" in no time at all, if this is all you can do. A neutral face with a Milla morph would be way better. 
I haven't seen any pictures of V4 but I'm really looking forward to seeing her, as I have always preferred using the Daz figures over the standard Poser ones.

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