Added a placeholder for str.format_map, as discussed with Raymond. My prose is horrible, some cleanup is required.
diff --git a/Doc/whatsnew/3.2.rst b/Doc/whatsnew/3.2.rst
index 94257ae..ea41f88 100644
--- a/Doc/whatsnew/3.2.rst
+++ b/Doc/whatsnew/3.2.rst
@@ -442,6 +442,26 @@
(Suggested by Mark Dickinson and implemented by Eric Smith in :issue:`7094`.)
+.. XXX * :meth:`str.format_map` was added, allowing an arbitrary mapping object
+ to be passed in to :meth:`str.format`. `somestring.format_map(mapping)`
+ is similar to `somestring.format(**mapping)`, except that in the latter
+ case `mapping` is convert to a `dict` and in the former case `mapping`
+ is used without modification. For example, to use a `defaultdict` with
+ formatting::
+
+ >>> from collections import defaultdict
+ >>> mapping = defaultdict(lambda: 'Europe', name='Guido')
+ >>> '{name} was born in {country}'.format_map(mapping)
+ 'Guido was born in Europe'
+
+ This is similar to %-formatting with a single mapping argument::
+
+ >>> '%(name)s was born in %(country)s' % mapping
+ 'Guido was born in Europe'
+
+ (Suggested by Raymond Hettinger and implemented by Eric Smith in
+ :issue:`6081`.)
+
* The interpreter can now be started with a quiet option, ``-q``, to suppress
the copyright and version information from being displayed in the interactive
mode. The option can be introspected using the :attr:`sys.flags` attribute::