From the conference page (http://openjdk.java.net/projects/mlvm/jvmlangsummit/) it seems like the talks were recorded by infoq who recorded last year's talks. If they follow the same method as last year these talks will slowly trickle onto the infoq website over the next few months. See http://www.infoq.com/JVMLanguageSummit for last year's talks.