0.3 isn't a complete release, but because there was interest, I've put the code online for those interested. I'll clean it up in the next couple of weeks, but until then it can be downloaded here: fbsd-tokens-0.3.tgz. The main differences include support for passing arbitrary kernel objects via file descriptors, and the beginning of a token management daemon.
Read this first -- introduction to the distribution and a key to useful files.
Release notes, Instructions
Experimental Authentication and Authorization Token Management Extensions in the FreeBSD Kernel (proposal)
License for source code -- please read this before downloading!
Code and documentation distribution -- also, copies of the above files.
For reference, the old 0.1 distribution is available for download, etc. This is no longer the supported version of the code.