The fact that the system will allow you to transfer save files between the old version of the game and the new version of the game tells me that any additional content must be fairly light. Typically, if a game adds a significant amount of content, then it cannot maintain compatibility with its older version as there have been vital changes to its programming. I hope that this move will encourage companies to take care of its games after their release, at least, as many games deserve more time after the release date.