Gets the "Precise distribution" a Python 3.3.3 release?

Do not expect any higher version of python3 for precise than the currently provided 3.2.3 in the official channels.

You have to understand the Ubuntu release policy. Ubuntu is no rolling release, but published a new release in a 6 months cycle.
That means that a package that has been provided in a certain version with an Ubuntu release, will - for that release - usually stay on that version. A higher version of that package will only provided with later Ubuntu releases.

Version upgrades to packages in older releases will be done only for specific packages (like kernel, timezone data, firefox, thunderbird, java, and a few more), or in case that a program has got a bug that is worth doing a SRU (see https://wiki.ubuntu.com/StableReleaseUpdates ).

If there is already a higher version for a specific package well running for a newer Ubuntu Release and all dependencies of the higher version can be fulfilled also on the older Ubuntu release, then there is the possibility to backport the higher version to an older Ubuntu release (see https://wiki.ubuntu.com/UbuntuBackports ).

And there of course is always the possibility, that someone compiles a package with a newer program version for an older release and provides that in a PPA, currently there is e.g. https://launchpad.net/~zulcss/+archive/py3k with python3 3.3.1 for precise.