xPattern is an open source fork based upon the 4.0 dev branch of Textpattern. It's goal is to improve the application to better fit the needs and desires of the community.
The biggest change you will notice in the initial release of xPattern will be a redesigned admin interface.
Over the years, there has been a very noticeable communication gap between the core developers of Textpattern and the rest of the community.
They have done a very good job of helping those in need, but for those of us who wanted to give back to the project, we felt stunted.