Wonder if the second season maybe could deal with the Klingons. They always seemed to be rivals with the Romulans in TNG (Although Worf sort of warmed to them slightly in Nemesis), and it'd be curious to see how things have affected the balance of power. In the "Online" game they did use it as an excuse to start another war; although the game revealed it to be part of them being manipulated by a third party (Kind of like in Deep Space Nine with the fake Martok).
Also would be the perfect excuse to bring back Worf.