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Yes. This was demoed at the GCP Live event a few weeks ago. I don't know if it's included in the public offering yet.

Some blog coverage here: http://blog.cloudbees.com/2014/03/jenkins-man-behind-curtain...

(Note: I work on Cloud at Google, although not on this part of it. Thus I'm going to be a little conservative and only discuss things I know we've announced)

edit: Oooooh, or just ask the TL: https://news.ycombinator.com/item?id=7617385

Absolutely. You probably want something like CircleCI (disclaimer: I work there). Here's our doc on deploying to GAE: https://circleci.com/docs/deploy-google-app-engine.

You typically will only be pushing in to master once the changes have passed through a CI system where you'd run all of your tests.

Most people pass their code to a CI system after it's been pushed. Run your unit tests locally, push your code, run it through your CI system (integration and unit tests, anything else), then push goldbits to production.

Yes, but on a different branch. CI runs tests then merges to master (or whatever branch triggers deployment) and pushes.