"Supported" depends on what you mean.

The only thing Genesis 3 has, at least in terms of the base figure, that Poser can't do right now is the dual quaternion bending, which isn't exclusive to DAZ, and the ability to read the file format. That's it, really, and that second one is a minor issue. Pretty much everything else such as the bones for use in facial expressions has been possible to use  in Poser for years.