Compared to V4, V3 has more detail, and not just aspects that make her look older. for instance, her knees, elbows, and back are just more defined.  She also has a defined shape to her orbital I've been completely unable to achieve with V4, nor seen anyone else achieve, despite it being a very common shape I can find in reference photos of people of various races.  V4 is undefined and smooth in a way that it's hard to get V3 to be, but it seems as hard for anyone to give V4 definition as it was to get rid of V3's.  To me, V4 is a lot like A3 with her realistic morph turned on, even in proportions.  Since A3 was wildly popular and more advanced due to the refinements made to each successive Unimesh figure, I can imagine DAZ using her as the template for the new generation rather than V3. 

In V3's time, more petitely proportioned figures were rare.  Now we don't have as many defined or broad-shouldered characters.  It would be great to see more variety instead of any one type of character.  I have way more V3 characters than V4 ones.  Probably because I was such a freebie hunter back then.  I'm betting you can still find some good V3 stuff in various places.  Certainly, she still has a pretty significant section in freestuff here.  And I notice Blackhearted's GND 2 is still being sold.  I could never get the morph to look as normal as the promos did (somehow I always managed to make it look way creepy thin instead of fit), but I personally found the texture to be very realistic.  Between that texture, the Irina 2.0 texture, and DAZ's International, I could do just about anything with V3 that V3 could do. 

A weight mapped V3 would be absolutely wonderful.  That said, I'm ecstatic to have Antonia WM and I'm really looking forward to V4 WM.  I am so much more than content; I'm almost overwhelmed with gratitude.  If Antonia is a gourmet meal, then revitalizing older figures with new rigging is a luscious dessert.