Summary: complete reimplementation, now with regression testing. C++ library completely rewritten using the STL. 95% of the code is now tested via the Python API in one big mongo test script.
One more brick in the wall...
Ryan Tomayko comments on GPL vs the Python community. My work-related libraries are LGPLed, and my GUIs and Web interfaces are GPLed. Why? I'm an academic programmer, and my code is owned by Caltech. Neither I nor Caltech depend on income from these programs. However, I do intend to take them from job to job, and the GPL protects that. The L/GPL also protects Caltech. win/win.