DSF support for Poser is not very likely. The Poser team does not have time to follow every whimp DAZ makes when it releases a new update to Genesis and/or the DSF format.

The CR2 exporter for Genesis in DS4 will probably be very limited. Load, morph, cloth your character in DS4, then export the result and use Poser to pose and render. This is the impression I got from remarks by DAZ people (no autofit for Poser, so no clothing fit in Poser, adding morphs and scaling have to be done before export)

If that is how it is going to be, I don't think it will be used much by Poser users.