I believe they made it clear near the release of P13 that the Unimesh tech was postponed indefinitely. They couldn't make it work in time.

The new content creator tools, AFAIK, are about the greatly improved Copy Joints and Copy Morphs in P13. Those are a godsend to rig clothes and to transfer all morphs in, they require very little fixing now from what I've seen so far. And those are already in the current, released P13. Edit: (and of course, enhanced/less buggy/more reliable creation tools all across, plus the new version of Superfly that makes much neater and faster renders, also skin can now look much more real with less effort and node noodle work.)

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.