Nashorn looks pretty interesting and I will be giving it a closer look when I come back home. They are also looking for people to help out so I am going to see if I can contribute anything useful.
Today I will be checking out a talk on Lambdas by Brian Goetz and will also be going to a talk on Big Data. Finally I also have some BOF (birds of a feather) sessions on evolutionary algorithms and writing parsers in Scala. Pretty interesting day and I'm looking forward to it!