There's a 5-year roadmap, and we're about halfway through it. Many of the most popular libs are already available in Py3. For example Django just released a version supporting it. https://news.ycombinator.com/item?id=3305021
They didn't cut a release with it, yet. The work has been done and it is or will be in a branch, but it still needs to be reviewed and "accepted" in order to move on.
