The game will be released in 3 episodes, we are confident that each episode will give the player plently to play in single player and repeat multi player as people compete to be top of the leaderboards. You will be able to play each episode independantly of the others but the story narrative will arc across all 3 episodes and if you have all three you will have to swap between them because Microsoft see each episode as a different game, they each have their own title id. We are working on all 3 episodes at once but there will be a gap inbetween each episode probably of a few months but that is still to be finalised. We think each episode will come in at about 500 meg.