It's a bit difficult to get excited over updates to presentation software. But the latest Google Slides update brings a new feature that should have been implemented ages ago - remote control with Android Wear devices. Google Slides has supported streaming presentations to Chromecasts for a while now, but you have always had to control the show from your phone (or your laptop, if using the web version).
The latest Google Slides update installs a companion app on your Android Wear device. When you start casting a presentation, a notification appears on your watch that opens the Wear app. The top of the UI shows the time you have spent on the current slide, the orange bar indicates how far along you are in the presentation, and the bottom shows a preview of the next slide. Tapping the screen switches to the next slide, but you can also swipe forward and back.
The remote control functionality does not work if you are presenting directly on an Android device, only if you are using a Chromecast.
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.