1) still PNU, though in-program you can choose what measurements it'll show. I've found that, when you export from Blender as Collada, it loads in Poser with correct measurements. Though for clothes you can just import the base figure's obj in Blender and model over that, when exporting the clothing as obj it'll load with the correct size in Poser.

2) Most figures for Poser come with DEV rigging cr2s, but if you load any figure as a bone/rigging donor in the Setup Room, it'll only load the bone and rig information now so you don't really need a blank cr2 anymore for most things. We now also have things like an INJ morph exporter built in, etc. There's a decent array of vendor/creator tools made for P12 in the store by now, too.

3) The cloth room was good to begin with, but sadly, due to copyright stuff with the Cloth Room engine, they aren't allowed to improve it at all. But there are some very good tools nowadays to work with the dynamics in Poser - things like jroulin's script that creates an easy simulation script for your clothing, to be loaded by your buyers directly from their library, or wolfnom's Cloth Presets script that gives you a drop-down list with premade settings for various fabric types. I have successfully converted some dForce clothing from G8f to La Femme (examples: find RPublishing's Genevieve and Fluttershy dresses for La Femme, those were my conversions), and it was pretty easy, I just exported them as obj in DS, loaded them in Blender and reshaped them to fit LF, cleared the DS groupings and created Poser Dynamics groups (Constrained for things that would follow the body without draping, like bodices; Soft Decorated for things like rim turnovers to give illusion of thickness; Hard Decorated for things like buttons), then imported that obj into Poser and set it up in the Cloth Room.

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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.