TL;DR Ember Data 1.0 is coming soon. We have a few last features to land before we
can confidently make guarantees around not breaking the API. Specifically:
- A guarantee that if one side of a two-way relationship changes, the other
side will remain in sync, even if it hasn't loaded yet. - All relationships will become async, but DataBoundPromises will make them
work well in observers, computed properties and in templates.