We just promoted the 1.2.0 RC to become the EMFStore 1.2.0 release. EMFStore now includes extension points and API which allow you to more simply replace the storage technology on client and on server side based on the EMF resource set abstraction. As a proof-of-concept we have implemented a mongoDB back-end based on Mongo-EMF.
To try EMFStore and get started please see the updated Getting Started with EMFStore tutorial. Enjoy!