I'm not absolutely certain -- it's been five years, and I don't use V4 for anything -- but I think both Phantom3D and Nerd took care to preserve the existing joint centers and orientations when they weight-mapped their versions. If those haven't changed, V4~WM should be able to use and save poses compatible with unweighted V4. I assume that's what you mean by movements, poses and animations?

The V4 mesh wasn't changed by any of the weight-mapping projects (that was forbidden by DAZ), so all shaping morphs should still work as before. Since the joints have been changed from zone-mapping to weight-mapping, JCMs or other joint-corrective morphs may no longer work, but ideally the weighting revisions make those irrelevant anyway.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.