As a user of your stuff, it doesn't feel like it. It's been a few months, but I always felt the Java documentation and samples were lacking compared to Scala. Then again things may have changed.
Or the logger interface. It's awful. Great that you use the sl4j interface, but I can't cast it to that type because it's a wrapper for the "real" logger written in Scala. It's annoying, and agreed- using Java in the Play framework feels more like a "look what else it can do" than an intentional use-case.
It uses Play's iteratee feature. Also integrates seamlessly with play. My point is that, while the Play team might develop for Java and Scala concurrently, the Play community most definitely is Scala first.
(I work for Typesafe.)