Graal is being used by Project Sumatra (GPGPU) and JRuby.

Sumatra is planned for integration latest by Java 10.

There were a few Java ONE 2014 and JVM Language Summit Presentations.

JRuby: The Hard Parts, Reduction on GPUs, GPU/JVM Cooperation

http://www.oracle.com/technetwork/java/javase/community/jlss...

Ruby on Top of Graal

https://old.parleys.com/share_channel.html#play/543f88bee4b0...

Sumatra OpenJDK Project Update: Parallelize Yourself with the Stream API

https://old.parleys.com/share_channel.html#play/543fa782e4b0...