The Google Play Movies & TV app is now available in the App Store. The app allows users to watch movies or TV shows they bought or rented from Google Play directly on their iOS devices. Unfortunately you can't buy movies from the app since Google opted not to pay Apple its 30% fee. Google also added Chromecast support so users can "cast" movies from their iPhone or iPad to their TV.
The app is free to download from the Apple App Store. It requires iOS 6.0 or later and is compatible with all iOS devices.