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Ouch. The '__class__' behavior is documented here too: http://docs.python.org/py3k/library/functions.html?highlight=__class__#super. Unfortunately I don't see any other documentation on the lexically scoped form of __class__.
As implied, cases like the following just don't work any longer:
>>> class X(object):
... def __init__(self):
... super(__class__, self).__init__()
... 
>>> X()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "<stdin>", line 3, in __init__
NameError: global name '__class__' is not defined
This worked fine in 3.2.