All problems, which were blocking stabilization of Python 3, have been fixed.
Stabilization of Python 3.1.2 is currently scheduled on 2010-04-19.
I'm attaching the news item for Python 3.1.

-- 
Arfrever Frehtes Taifersar Arahesis

Title: Python 3.1
Author: Arfrever Frehtes Taifersar Arahesis <Arfrever@g.o>
Content-Type: text/plain
Posted: 2010-03-04
Revision: 1
News-Item-Format: 1.0
Display-If-Installed: =dev-lang/python-3.1*

Python 3 is a new major version of Python and is intentionally incompatible
with Python 2. Many external modules have not been ported yet to Python 3, so
currently Python 3.1 should not be set as main active version of Python.
Setting Python 3.1 as main active version of Python is currently unsupported.
When it will change, a separate news item will be created to notify users.

'eselect python COMMAND --python3 [ARGUMENTS]' can be used to manage
configuration of active version of Python 3.

Although Python 3.1 should not be set as main active version of Python, users
should run python-updater after installation of Python 3.1. By default,
modules, which support both Python 2 and Python 3, are installed for both
active version of Python 2 and active version of Python 3, when both Python 2
and Python 3 are installed.

It is recommended to use a UTF-8 locale to avoid potential problems. Especially
C and POSIX locales are discouraged. If locale has not been explicitly set,
then POSIX locale is used, so users should explicitly set locale. Problems
occuring only with non-UTF-8 locales should be reported directly to upstream
developers of given packages.