Thanks! I can't imagine you'd want to use Dropwizard with Play! since they both accomplish similar tasks. That said, I'm not really familiar with Play, but to my understanding its a full web application framework. Dropwizard focuses more around creating web APIs but it does include a templating library in case you want to create applications beyond APIs.

Also, here is a presentation from the author of the "Play Framework Cookbook" walking through using Dropwizard: http://spinscale.github.com/dropwizard/2012-03-intro.html#/