My biggest hope for Google IO '14 is the announcement of Kotlin as the Android language. Yes, you can already use Kotlin for Android actually but it's not well-supported and the community is small.
The benefit for Google and developers would be clear -- no more Java and Oracle shenanigans. Google already has a solid relationship with JetBrains due to the fact that Android Studio is just IntelliJ CE. They could hammer out details about who owns it, what the future looks like, etc. The transition would be easy since Kotlin already plays well with Java.
JetBrains would have a massive win as well since it would drive sales of IntelliJ like no other.
While we've still got lots of catching up to do, I think Dart is doing pretty well given its youth. (I would include TypeScript in the above but unfortunately the language detection for it is broken so it reports a bunch of Qt C++ projects as TypeScript).
> I would include TypeScript in the above but unfortunately the language detection for it is broken
The broke seems to be intermittent only. The Groovy results seem to be permanently broken though - most of its results are multi-language projects where Groovy is used by a single Gradle build script.
The benefit for Google and developers would be clear -- no more Java and Oracle shenanigans. Google already has a solid relationship with JetBrains due to the fact that Android Studio is just IntelliJ CE. They could hammer out details about who owns it, what the future looks like, etc. The transition would be easy since Kotlin already plays well with Java.
JetBrains would have a massive win as well since it would drive sales of IntelliJ like no other.