The relase notes also mention potential problems with these changes. I ran into RuntimeError: App registry isn't ready yet while using the self-contained tests approach, but the fix is as simple as mentioned in the relase notes.
import django django.setup()
If your code needs to run on Django < 1.7 as well you could use
# Django 1.7 try: import django django.setup() except AttributeError: pass
Update: Dieter's comment actually made me think about my code for a second and I'll be using something different:
import django if hasattr(django, 'setup'): django.setup()