Michael,

Something strange is going on with the Illustrator copy buffer in regards to Photoshop.

I know Photoshop hasn't been the direct target for this feature during developement, but it worked flawlessly with it in the previous(Aug 13th) beta.
Which isn't unexpected since copying and pasting curves between Photoshop and Illustrator has been a feature since at least since CS2.

The behavior is somewhat erratic, but most often when you attempt to paste in Photoshop, you'll get the paste UI as expected, but
when you choose 'OK' the following error is thrown, 'Could not complete the Paste command because the source rectangle is empty'
Any assortment of solids in Moi should demonstrate this issue.

Sometimes it will work correctly(not sure why), though if you use the 3D viewport as the source what you get in Photoshop is usually flipped vertically.

I've attached a .3dm that demostrates this last problem. Load it into the latest beta. Don't adjust the camera in any way and select the curves.
Copy it to the Illustrator copy buffer, with 'Projection View' set to '3D'. Paste into a Photoshop document as 'Path' or 'Shape Layer'; it will work but
the result will be flipped vertically. Now orbit the camera to a different position and try another copy/paste, sometimes this fixes things and sometimes it doesn't

This issue isn't a complete roadblock, you can paste to Illustrator then immediately copy and paste into Photoshop and everything works as expected every time,
so more like a construction detour blocking that nice shortcut you just discovered the other day.

-Jeff