Zachary Ware upgraded python.org's  buildbot from 0.8 to 0.9:

https://www.python.org/dev/buildbot/

buildbot 0.9 is the first release of buildbot that
can run on Python 3.  The python.org buildbot master is running on Python
3.4:

http://buildbot.python.org/all/#/about

That master is connected to multiple workers/slaves, most of which are
0.8 running on Python 2:

http://buildbot.python.org/all/#/workers

This is a highly visible deployment of Twisted running Python 3,
and aligns with python.org's direction to move the world to Python 3. :)

--
Craig