I also tested Django with Python 2.7.10rc1 and found a backwards incompatible change which has been reverted.
https://bugs.python.org/issue24134
Triaged
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https://code.djangoproject.com/ticket/24779 - django-1.8.1 fails test with pypy - FAIL: test_serialize_datetime_safe (migrations.test_writer.WriterTests) (accepted)
https://code.djangoproject.com/ticket/24780 - custom-users-and-signals docs out of date (fixed)
https://code.djangoproject.com/ticket/24790 - Migrations remove / add field after rename it (duplicate)
https://code.djangoproject.com/ticket/24792 - Be able to run a ´makemigrations´ and/or ´migrate´ via url (won’t fix)
https://code.djangoproject.com/ticket/24794 - RunPython parameter "atomic" is ineffective. (duplicate)
https://code.djangoproject.com/ticket/24768 - KeyError: u"Problem installing fixture '<filename>.json': u'manager'" (needsinfo)
https://code.djangoproject.com/ticket/24802 - gis_tests.geoadmin.tests fails (fixed)
Authored
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https://github.com/django/django/pull/4650 - Fixed #24630 -- Clarified docs about RunPython transactions.
https://github.com/django/django/pull/4652 - Fixed #24751 -- Fixed HStoreField isnull lookup.
Reviewed/committed
------------------
https://github.com/django/django/pull/4642 - Fixed #24766 -- Added join promotion for Case expressions
https://github.com/django/django/pull/4612 - Fixed #24748 -- Fixed incorrect GROUP BY on MySQL in some queries
https://github.com/django/django/pull/4410 - Fixed #24553 -- Added the list of available applications to AdminSite.each_context()
https://github.com/django/django/pull/4646 - Allowed runserver sublcasses to easily override the default port.
https://github.com/django/django/pull/4639 - Light edits to docs/topics/forms/index.txt
https://github.com/django/django/pull/4644 - Fixed #24698, #24712 -- Added ForeignKey.get_db_prep_value()
https://github.com/django/django/pull/4603 - Fixed #24105 -- Called Storage.get_valid_name() when upload_to is callable
https://github.com/django/django/pull/4629 - Minor edits to docs/topics/http/urls.txt
https://github.com/django/django/pull/4658 - Fixed #24799 -- Fixed session cookie deletion when using SESSION_COOKIE_DOMAIN
https://github.com/django/django/pull/4661 - Fixed #24774 -- Made contrib.site's Site.domain field unique
Reviews of core dev work
------------------------
https://github.com/django/django/pull/4655 - Fixed #24757 -- Recreated MySQL index when needed during unique_together removal
https://github.com/django/django/pull/4601 - Refactored adaptation and conversion of aware datetimes
https://github.com/django/django/pull/4660 - Fixed #24791 -- Added fallback when 'postgres' database isn't available
https://github.com/django/django/pull/4657 - Fixed #24783 -- Refactored template library registration.