Preview problems in Rhino WIP.

This week I installed Rhino WIP (6.0.17283.09031).

I really enjoyed using new "Rendered", "Arctic" and "Raytraced" display mode, and of course new [Custom Preview] component for grasshopper.

But it seems that grasshopper only previews meshes and surfaces in these display mode.
Is there any way to preview curves, points, planes, dimensions, etc?