One of the new packages in HEAD is org.eclipse.core.databinding.observable.masterdetail. It contains observable implementations that provide master detail behavior. This can be a little confusing at first glance so I thought I'd take a shot at creating a sequence diagram to describe the inner workings. Possibly this, or some form of it, will get worked into our documentation but I thought I'd throw it out there for anyone looking at the latest API.
Comments are greatly appreciated. Also if someone knows where I can get a higher resolution Eclipse logo I'd appreciate the tip.