I really see a problem with understanding here! 

From what I have read, since the beginning of this thread, is that Dawn will be in basically TWO NEW, INDEPENDANT figures, one rigged to work in Poser and using the poser rigging technology, AND one rigged to work in DS, using DS rigging technology. The mesh (figure shape) will be the shared with both figures.

If this is the case (and I'm pretty sure it is) then clothing made for the Poser Dawn will not be automatically usable on the DS Dawn, even though the mesh will fit the figure in both programs. Therefore vendors will have to do twice the rigging but not twice the modelling.

To me this means that there will be Poser only content creators (I fall into this catagory as I know virtually nothing about DS rigging), there will be DS only content creators, who do not know Posers rigging, and there will be content creators with the knowledge of both programs and will create versions usable in both program. I suspect even those that know both programs will offer a DS version and a seperate Poser version, but that's only speculation based on the fact that if that if they have to do the rigging twice it would be foolish not to, but who knows.