I was in the audience and was a heavy Python user at the time.

As another commenter mentioned, this was during a round of several lightning talks. These talks generally can be about pretty much anything. I don't remember the others, but I definitely remembered this one.

At the time, dotCloud had oriented itself as a PaaS that also had first-class support for Python (Heroku was still very Ruby/Rails-focused), so it makes sense that they'd want to show off what they were building at a conference with Python developers.