Chromecast has apparently received support for Google Drive presentations, something that should drastically change just how useful the product is for offices and schools. This feature was previously visible to only a limited number of users while Google worked out the kinks, but now it looks like it may be ready for primetime. The option is visible to us, along with plenty of you as well.
To cast a presentation, hit the Present button in the top right corner. If, and only if, you have the Chromecast extension installed, you should see the option to Present on another device. From here, you can select which device to cast to.
As of now, this feature only works with Google Drive running on a desktop or laptop. There's no support within the Android app, though that doesn't mean we won't see it creep in somewhere down the line.
Thanks, Josh Decker.