Well, maybe the rendering engine isn't the main reason to update for the author of PoseRay. Just guessing, of course.

1.) The morph brush does affect all meshes, is no longer limited to certain groups, creates saveable morphs and works on the morphed mesh. It's not quite as controllable as comparable functions in external modeling applications like Silo or ZBrush. It's great for small fixes, but not for creating new full boxy morphs. If you want to work with posed characters in an external applications, I would suggest you get Colorcurvatures PML, which can export a (welded) mesh for morphing in an external application and reloading as a morph in Poser.

2.) Short answer: No.

3.) No, that's fixed.

4.) It's faster now, but the quality seems to be the same. Works for me.

5.) Yes, normal morphs can be removed. I'm not sure about full body morphs. Also, you can link several parameters to a single dial now. (Things like bend arm - larger bizeps, even much more complex dependencies are possible)

6.) Not to my knowledge, no. You can search the library, but not the morphs. You can rearrange them in groups though.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

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