Hi Eitan! By mentioning Utah, we actually meant the demo is being performed in Utah. We're not saying nor implying that the Workspace Builder feature is available as of Utah 😉 ^Jantien
Heard back from our expert and this is his answer: App Engine Management Center comes with deployment pipelines. After the approval of a deployment request, the new version of the custom app is automatically installed on the next instance. Hope this helps! ^Jantien