So far we've seen the Sith Empire and Galactic Republic as the 2 main governments in The Old Republic. You can even count Czerka as their own self-ruling state, the Mandalorians and their small territories, and the Hutt Cartel also. But I wonder if TOR will actually take advantage of using actual neutral governments.
Say for example, you are aligned with the Sith Empire and you visit planet X (which has a neutral government). Now on planet X, you do a series of actions that will either turn to the planet to the Sith or away from them.
Kinda like Manaan in KoTOR 1 in a way.