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io.TextIOWrapper acquired a new "write_through" argument for 3.3, but that is not exposed as a documented attribute.
This is needed so that a text wrapper can be replaced with an equivalent that only alters selected settings (such as the Unicode error handler).

Updating issue title, since I realised this doesn't work in 3.2 either (the "newline" argument also isn't available for introspection - "newlines" is not the same thing)
Possible API signature:
 _missing = object()
 def rewrap(self, encoding=_missing, errors=_missing, newline=_missing, line_buffering=_missing, write_through=_missing):
 pass
That is, accept the same arguments as __init__ (excluding the buffer argument), with any arguments not explicitly supplied replaced with the values from the current instance.

@Nick would you like or even need this in 3.5?

TextIOWrapper now has reconfigure() method.
Can this issue be closed?

Aye, let's close this for now - swapping streams out has enough other problems with stale references to the original stream that using reconfigure() to update the existing stream in place is usually going to be the better option.