Google Play Services 4.2
The latest release of Google Play services has begun rolling out to Android devices worldwide. It includes the full release of the Google Cast SDK, for developing and publishing Google Cast-ready apps.
Once the rollout is complete, you'll be able to download the Google Play services SDK using the SDK Manager and get started with the new APIs. Watch for more information coming soon.
Google Cast SDK
The Google Cast SDK makes it easy to bring your content to the TV. There’s no need to create a new app — just incorporate the SDK into your existing mobile and web apps. You are in control of how and when you publish your Google Cast-ready app to users through the Google Cast developer console. Find out more by reading Ready to Cast on the Google Developers Blog.
Google Drive
The Google Drive API introduced in Google Play services 4.1 has graduated from developer preview. The latest version includes refinements to the API as well as improved performance and stability.
More About Google Play Services
To learn more about Google Play services and the APIs available to you through it, visit the Google Services area of the Android Developers site. Details on the APIs are available in the API reference.
For information about getting started with Google Play services APIs, see Set Up Google Play Services SDK