The Android 4.1 new feature that turns NFC connectivity into bluetooth makes device connectivity into a much simpler process and sets the foundation for new creative products. Nexus Q is one of them.

Stable Values in Java (JEP 502): Deferred Immutability with JVM Trust
Explore Stable Values – a new Java 25 upcoming feature (JEP 502) enabling lazy initialization with immutable performance and JVM-level optimizations.