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PEP 405 is for "venv" support and that is available. Documenting how to use pip/distribute/setuptools with venv is IMHO beyond the scope of the stdlib documentation (and should be easy enough: create a virtual environment using pyvenv, then install pip using its setup.py file).
The pep mentions the pysetup script from the packaging module, but as the packaging module got pulled for python 3.3 the pysetup script is not present in the python 3.3 installation and therefore also not in venv-s.