The Poser successor to V4 should come from DAZ. They could release a new V5 for Poser... poser rigged and weightmapped. A separate figure with clothes for it also targeted to Poser users. Why not tap back into that market. If they want they could create a clone for Genesis 2 Female so any clothes for the new poser figure could be autofit to G2F. 

Otherwise is see the gap widening... esp. when vendors need to include Iray and 3delight materials for DAZ products... guess what Poser Materials will be dropped.. its already happening. 

As for Sixus... I have alot of his cool monsters... but this effort seems out of the blue... at least Dawn had the community working with them before her release.