This is a nice idea.

We build a lot of mobile apps, and we use a combination of the Django admin, and django-tastypie. This gets a JSON API up and running with authentication in very short order, but a product in this space would be very welcome, especially as it allows the data model to be built with a GUI. Our programmers spend a lot of time on model development and being able to delegate that to less technical staff would be a big benefit.

White-label would obviously be a very strong requirement.