Consider the below just an opinion based on a careful look and analysis at the rumors and facts slowly emerging from various sources.
Ok B&B have resisted bringing the Romulans into the show since it began look at the comments from last summer which essentually said 'be nice but we feel no obligation' blah blah blach.
Well no Blah blah blah. Berman recently has began to make positive statments towards bringing the Romulans in. Rumors have floated that John Logan (writer Trek X and Gladiator) has officially been asked to write there episodes or at least the basics of the story and he has said publicly he would love to if his schedule permits. But then Braga continues to drone on how the Temporal Cold War is great and that we will see more and more of it next season, Berman has made no comment. Brage has insulted fandom while Berman has kept his mouth shut. Could the honeymoon between the two be coming to an end as Berman sees how refreashingly new Trek X is with freash new production people working on it. Are the same feelings that drove a young Berman to unseat the bird in TNG and reinvent the whole show in a positive way coming back at last. Facts seem to indicate that older established races bring in better ratings such as the Vulcans, Andorians, Feringi and Klingons as well as being the better episodes this season while the worst performers have been those on the whole awful Temporal Cold War arc, Braga's baby.
As we see more and more rumors on the Romulans take it as a sign that there are cracks emerging in the unholy alliance known as B&B. If any episodes go into production on the Romulans before the Temporal Cold War is resolved look for Braga to be on his way out, at last, very soon there after, if not before.