What's the status on adding Bitbucket Cloud as an integration for Cloud CI/CD?

CI vars and detection are already supported: https://github.com/pulumi/pulumi/blob/d7f24dfcfbec7fd02aa2162a35e9fcf6a877b161/sdk/go/common/util/ciutil/bitbucket_pipelines.go https://github.com/pulumi/pulumi/blob/d7f24dfcfbec7fd02aa2162a35e9fcf6a877b161/sdk/go/common/util/ciutil/detect.go

With Go, manually. What I want is full integration, like with Github, as I'd prefer to not have our entire codebase used to feel Microsoft's AI.

Those features are available via Pulumi, not via any particular SDK: there is nothing Go-specific in there (the engine just happens to be written in Go, that's all). The Pulumi engine can detect when it's being run via Bitbucket pipelines, and puts the correct meta-info in the preview and up pages. Which feature(s) are you looking for? Commenting on the PR? That's provided by the GitHub action so it's not available via Pipelines PRs, but you can see the output of

pulumi up

etc. in the Pipelines console, "Build" tab.

I mean here:

Yea, that just gives the improved PR reports, I think? I've never noticed anything special for any CI system except GitHub, and that's because of the Action.

It also would simplify setting up using Deployments though, wouldn't it? If I could treat it as an integration?

I'm not sure. I've only set up Deployments once, with OIDC, and nothing special was required. I don't know what features those things add. Maybe there's a SDK over the API, that it providers? I don't know...