From what I've read, the beta will be on the scale of a full game release. I'm expecting that all areas will be accessible. This means we will be able to travel to all the planets during the beta (but not necessarily at the start, as there may be some progression required to visit, say, Venus.). However, I'm guessing that we will not be able to play every mission available on every planet/location. This is where bungie will keep us guessing for the entire game. I'm not really worried about the where aspect of the beta, as no matter what there will be enough to play, even if I'm wrong. I'm more interested in knowing what we can take away from the beta, such as gear, experience points, and weapons. Become Legend!