Google unveils Hangouts: a unified messaging system for Android, iOS, and Chrome
Google Chrome Racer experiment connects Android and iOS devices for multiplayer gaming
Google+ completely redesigned with new cards-based interface
Google takes on Apple in schools with Google Play for Education
Google turns the Samsung Galaxy S4 into a Nexus phone, coming June 26th for $649
Google redesigning Play apps and Play Store on the web
Google takes on Spotify with Google Play Music All Access subscription service
Google Play services updated with new location, Google+ sign-in, and cloud messaging APIs
Google announces Android Studio, a new development environment for Android
Google announces Play game services, Android's cross-platform answer to Game Center
Google: 900 million Android activations to date, 48 billion app downloads

Developer stuff:

* Google announces Android Studio, a new dev environment for Android
* webM VP9 codec being compared to H.264 — it's 63 percent smaller, showing the same quality
* WebP image is 30 percent smaller than JPEG at the same quality.
at a lower bitrate.
* V8 Javascript engine improved 57 percent on mobile in the last year.
* Now onto custom HTML tags that can be reused.
* 450Milions monthly active users for Chrome in the middle of 2012. Added over 300Milions new users in the last year, over 750m active monthly users now.
* Google Cloud Messaging, or GCM. Super well-received, 60 percent of the top apps in Play are using GCM." 17 billion GCM messages a day.
http://live.theverge.com/live-google-io-2013/