Took me a while to discover that the oscar v1.0.2 was missing files for the reviews app that prevented my forking from working.
$ pip show django-oscar
---
Name: django-oscar
Version: 1.0.2
~/.virtualenv/lib/python2.7/site-packages/oscar/apps/catalogue/reviews$ ls
abstract_models.py admin.py app.py forms.py __init__.py managers.py migrations models.pyc signals.pyc views.py
abstract_models.pyc admin.pyc app.pyc forms.pyc __init__.pyc managers.pyc models.py signals.py south_migrations views.pyc
$ pip install django-oscar --upgrade
Requirement already up-to-date: django-oscar in ~/.virtualenv/lib/python2.7/site-packages
Is there a newer version available?