When Google released the all new Podcasts app (again), many people were surprised its stark lack of features. Many things were missing, like auto-downloading, Cast support, and Android Auto integration. While many of these things have either trickled in, or are obviously on the to-do list, Google v8.91 is finally checking Auto support off of that list.
As you would expect from an Android Auto interface, this looks like most of the other podcast players out there. The only appreciable differences are in the navigation drawer, which currently provides four groups: Your Podcasts, New Episodes, Downloads, and In Progress.
The player offers the standard Next / Previous buttons, plus a couple buttons for shifting back 10 seconds or forward by 30 — but there's no overflow button for additional commands.
If you use Android Auto, update to the latest version of the Google app and you should be able to see a new entry in your audio selector for Podcasts. Availability is definitely tied to the new version of the Google app, which may not be available to everybody yet, but it's still unclear if this is a staged rollout or if everybody gets it automatically.
The APK is signed by Google and upgrades your existing app. The cryptographic signature guarantees that the file is safe to install and was not tampered with in any way. Rather than wait for Google to push this download to your devices, which can take days, download and install it just like any other APK.