The eponymous Voss are isolated against the other natives, the Gormaks, and have been fighting a long and losing war in which Gormak assaults have all but destroyed them. But the reclusive Voss are powerful natural Force users, an asset to either major galactic power. Both are trying to gain the allegiance of these potentially powerful allies, even as they stare one another down.
The possibility for diverse adventures are obvious -- do you try and talk the Voss into helping your faction? Wipe out the Gormak? Attack your enemies when they're distracted? Ensure that if you don't get the aid of the Voss, no one does? The full reveal talks more about what looks poised to be a divisive part of Star Wars: The Old Republic, whatever path you would take.