You can find the code here: https://bitbucket.org/vinay.sajip/django. I'm still trying this out myself, but one interesting thing to note is that Vinay chose to use a single-source strategy instead of running things through 2to3.
Impressive! Is python 2.5 still supported? In my experience (with Tornado) it's difficult to get a single codebase to work on 2.x and 3.x without using some of the features introduced in 2.6.
Yes, in the latest development branch they dropped support for python 2.4 though.