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As of June 2016, Django 1.9 is out and on version 1.9.7. It is not a long-term-support (LTS) release and we haven't made the decision to upgrade edx-platform's Django to it yet. However, it must happen eventually.
Release Changes
Official:
https://docs.djangoproject.com/en/1.9/releases/1.9/
Broken down onto a Confluence page with created JIRA tickets:
Django 1.9 Release Notes and Stories
Deprecation
In the current Django 1.8 that edx-platform uses, we've eliminated nearly all the deprecation messages that warn us about functionality that will not be supported in Django 1.9. However, one particularly annoying message remained:
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