I just tried her. She does take V4 textures, but not the MAT poses. The material names have been changed and some have been combined.

She works well with EZSkin after you define the materials.

Polycount is 122K. There are a no real full body morphs present, there are morphs for breast, waist, thighs and some others. Expressions are quite nice, but only a few face morphs. So I expect there will be a few morph packs.

There is a Standard Rio, a version with extended JCM and 3 version for morph and clothing creators.

The bodytype is different from V4. This means that tight dynamic clothes have to be adapted for this shape. V4 conforming clothes will not work (as expected).

Hair needs to be fitted, but seems to be easy at first try, the shape of the skull is similar

Overal first impression: I like the facial expressions and the bodyshape. I hope there will be some clothing packs and morphs available soon from Billy-t