Looks like Emacs 24.3 is an official release now. Mickey at Mastering Emacs has an overview of some of the changes:
A new version of python.el, which provides several new features, including: per-buffer shells, better indentation, Python 3 support, and improved shell-interaction compatible with iPython (and virtually any other text based shell).
I blogged about a new python mode a long time ago and it seems it’s made it into trunk. That’s probably good news for most Python users, but as I haven’t yet explored the new python.el mode yet, I will cover this in much greater detail in another post.
Better iPython integration would be a boon although I’ll admit the Emacs IPython Notebook is pretty saucy. Definitely, a must test drive.