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I looked at the CLI options for `pulumi preview` but didn't see anything that seemed relevant

The diff should include the new thing, unless it's fully generated (e.g., an id value). What object isn't showing the new values?

so for example for `gcp:projects:IAMBinding` in the `Diff` view I just see `delete-replaced`

I don't know the resource. According to <https://www.pulumi.com/registry/packages/gcp/api-docs/projects/iambinding/#outputs>, the only outputs on that object are computed (etag and id), so there might not be anything to show.

Unless some of the inputs are outputs as well?