Puppet 3.3 was released last week.
As part of that release, hiera2 and puppet data in modules is available in the testing mode.
I have been working with William van Hevelingen to build an example module/tutorial on Puppet data in Modules.
Our example module is available at: https://github.com/pro-puppet/puppet-module-startrek.
We hope to expand this further as the community learns more about how to use this new feature.