USD - Arnold User Guide
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USD kitchen set asset available here. NVIDIA USD attic asset available here.
A procedural node that is capable of reading USD files.
This page provides information on USD (Universal Scene Description) compatibility.
An introduction to Arnold USD page can be found here.
USDZ
You can render USDZ files with kick, load them with the USD procedural, and render them in a Hydra render delegate.
Some example USDZ files can be downloaded here.
When reading a .usdz file, any generated .tx files are written to and read from a folder name <usdz_filename>.usdz_tx.
Distant lights support the normalize attribute, so you can disable normalize (before it was always enabled and the normalize attribute was ignored). You can use the Arnold option usd_legacy_distant_light_normalize to roll back to the previous behaviour.