So ist aktuell Stand der Dinge: http://mail.openjdk.java.net/pipermail/lambda-dev/2014-March/011938.html in Referenz zu http://openjdk.java.net/jeps/186:
Just to close the loop here, we've reached the conclusion that we will not be pursuing collection literals as a language feature right now, but instead proceeding in the short term with a library-based proposal that is similar to what Stephen has described here, with a few ideas from Guava's ImmutableXxx classes.