For holdouts, the holdout shadow AOV is now written into the alpha channel of the primary image by default. To cause a separate image to be written out for holdout shadows, there is a setting under the Advanced tab in the Render Settings called "Output Shadow AOV" which can be set to "As Separate AOV".
We've introduced new passes to the menu, Ci (color), a (alpha), and shadow.
Xgen custom shader parameters are now attached as primvars when using Xgen archive instancing.

Light linking now works as expected for lights that aren't members of the defaultLightSet.
Fixed an error in PxrProjector that would prevent the "WPref+WNref" method from working.
Fixed a bug where when using the custom geometry API, cachShape was called more than once per motion sample.
Fixed a bug where batch renders of a single frame with motion blur enabled would fail.
Fixed a crash when rendering OpenVDB on headless render nodes.
Don't emit "could not acquire texture" warnings for Maya File atlas textures.

Known Limitations

Modifying light visibility while in IPR mode does not change light visibility
Maya fluids will currently only render if you add RenderMan volume controls. Select the fluid shape and in the AE, do Attributes->RenderMan->Add Volume Controls
Creating a mesh light during IPR will retain the old geometry (non-mesh light). A refreshed IPR session will remove the old geometry.
Prior versions of RenderMan for Maya are not compatible with RenderMan 21.0. Trying to load the version 20.0 plugin with RenderMan Pro Server 21 installed will cause the following warnings: "rfm Warning: skipping unknown Slim keyword: requires" when loaded. The 20.X plugin will not function correctly.
Deselecting "Receive Shadows" does not work.

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