I really hope people keep their expectations in check (yeah i know who am i kidding?)
they will have their own storyline but dont expect 40-50 solid levels of missions. there is no way they can hammer out that much content. it will most likely use the FE already in place, possibly some converted missions, and the usually array of events and what not to get us there.
there will be unique romulan missions, there many even be a fair bit but dont expect it to look anything as full as the fed faction.