From what I've seen, it deosn't appear to take a Linear path, thus making it a free roaming and thus pretty much open game. I the first one, you were in the Village outside of Vizima, and until you met certain criteria, you couldn't enter Vizima. Once in the city, you could not get back to the villiage, and even part of Vizima was blocked off, but you have the swamps to play in. In short, one was pretty much lnear in nature and not really free roaming. In 3, it appears that you can fast travel around the game world, once you have visited the place, which may allow for coming back t finish or start new side quests. From my take, you will have plenty of stuff to do outside of the main story quest. One thing for sure, my guess is, seeing as how it is the last of the series, CDPR is going to take it out with a bang.