The GMF Dashboard distinguishes all the models that have to be created and combined to create the editor. Domain Model can be found in the center and all the other models, that are derived form it, are placed around. Although the Dashboard only starts the appropriate wizards, it helps not to forget about anything important and shows all the time on what stage of the process we are.
I think that it is a great thing for all the newcomers, who have just started using GMF and are afraid of the complexity of this framework (so it is perfect for me ;-) ). It's maybe not something new, but for sure worth noticing.