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It's not back to the 3.2 behavior. In 3.3, Py_UNICODE is always equal to wchar_t, which is a 4-byte type on Darwin. However, CFString is based on UniChar, which is a 2-byte type.
That this worked in 3.2 was by accident - it would work only in "narrow" builds. Python's configure in 3.2 and before wouldn't default to using wchar_t on Darwin since it didn't consider wchar_t "usable", which in turn happened because wchar_t is signed on Darwin, but Py_UNICODE was understood to be unsigned.
Since it's too late to add an 'U' code to 3.3, as a work-around, you would have to use a 'H' array, and initialize it with map(ord, the_string)).
Chances are good that a proper UCS-2 array code gets added to 3.4.