In case you would like to test multiplatform (Linux,Windows, Mac soon) GUI wallet interface with PoS feature - third refresh :
https://github.com/root8/fsigDecredGUI/releases/tag/0.0.3

Please note new main release with GUI for Windows is Scheduled For Monday Aug 15 2016 with PoS enabled as well :
https://forum.decred.org/threads/0-3-0-release-scheduled-for-monday-aug-15-2016.3956/