While there is no new documentation, I have converted the backend to its own database so I can use YaWiki to manage the existing Savant2 documentation in parallel with the new Savant3 documentation. (The Savant3 pages are lamentably lacking, with only a home page, but that should change as I move it closer to a stable release.)
Savant is a lightweight, object-oriented template system for PHP. I call it the simple, elegant, and powerful alternative to Smarty. Savant2 was written for PHP4; while it works with PHP5 out of the box, it is not E_STRICT compliant. Savant3 *is* E_STRICT compliant, sports a nicer plugin system using __call() magic, and comes with a modified set of default plugins.