Sergey Brin and Steve Horowitz discuss the availability of the SDK, that it will be open source in the future, and demo applications on the Android platform.
Google I/O 2014 - What's new in Android
Google Shows Off 'L', Android One
Android L hands-on | Google I/O 2014
Google's Android L - What we love and hate
Introducing Android Wear Developer Preview
Google I/O 2013 - What's New in Android Developer Tools
How Google Is Making Android Faster With ART!