Well we all pretty much know it's going to be split up into certain areas and you won't be able free raom like you can with wow, Even wow lags, and as shit as the graphics are it shouldn't really. Huxley have tried to overcome this problem and failed due to a large strain on their servers so instead they have opted for battle portals. You will be able to free roam the city in 3rd person view and only free roam firendly areas and if you want to fight just free roam in 3rd person view till you get a gang of guys then head for your nearest battle portal.
Either way trying to be no1 on the entire server seems more fun than just trying to get no1 on a certain map, So whatever the outcome i've prepared myself to be happy either way.