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[1.6.x] Release notes for ORM changes in 1.6

Backport of 4301d6f from master
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25 docs/releases/1.6.txt
@@ -812,6 +812,31 @@ as JSON requires string keys, you will likely run into problems if you are
using non-string keys in ``request.session``. See the
:ref:`session_serialization` documentation for more details.
+Object Relational Mapper changes
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Django 1.6 contains many changes to the ORM. These changes fall mostly in
+three categories:
+
+ 1. Bug fixes (e.g. proper join clauses for generic relations, query
+ combining, join promotion, and join trimming fixes)
+ 2. Preparation for new features. For example the ORM is now internally ready
+ for multicolumn foreign keys.
+ 3. General cleanup.
+
+These changes can result in some compatibility problems. For example, some
+queries will now generate different table aliases. This can affect
+:meth:`QuerySet.extra() <django.db.models.query.QuerySet.extra>`. In addition
+some queries will now produce different results. An example is
+:meth:`exclude(condition) <django.db.models.query.QuerySet.exclude>`
+where the condition is a complex one (referencing multijoins inside
+:class:`Q objects <django.db.models.Q>`). In many cases the affected
+queries didn't produce correct results in Django 1.5 but do now.
+Unfortunately there are also cases that produce different results, but
+neither Django 1.5 nor 1.6 produce correct results.
+
+Finally, there have been many changes to the ORM internal APIs.
+
Miscellaneous
~~~~~~~~~~~~~
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