PRISM is under constant development. This means that some of the most recent improvements, extensions and bug fixes may not yet be available in the version available for general download.
Here, you can get access to development versions of PRISM. These are basically recent snapshots from the Subversion repository used by the PRISM developers. Please note:
Currently, the main public release of PRISM (version 3.2) is the most up-to-date available. Check back here soon for updates.