It looks like they're taking a new strategy with this move. Pip isn't actually going to be moved to the standard library to live; rather, a new "ensurepip" command that installs "pip" will be a part of Python proper.
However, a distributable version of pip will be included with each release so that ensurepip does not have to contact the PyPI servers during an install. And with each maintenance release of Python, this pre-included version will be updated to match the then-current pip release.
But, the bottom line is that pip still lives outside of the standard library. Python 3.4+ is just guaranteeing that you have a version installed.
However, a distributable version of pip will be included with each release so that ensurepip does not have to contact the PyPI servers during an install. And with each maintenance release of Python, this pre-included version will be updated to match the then-current pip release.
But, the bottom line is that pip still lives outside of the standard library. Python 3.4+ is just guaranteeing that you have a version installed.