They have revealed what is in Going Rogue, and it's a lot. In addition to the two new power sets, they are adding in Praetoria as an entirely new world. There are tons of missions and zones to go with it, new enemies to fight the whole nine yards with that. Then there is the whole 'going rogue' system that the expansion is named after, where you can lead your heroes down the dark path or your villains to redemption. Or even straddle the line between the two. That opens up the other half of the game to all existing games, and the new missions that allow you to change their allegiance. And then there is the new graphics Ultra mode. It seems like money well spent to me if you like the game.