Board Thread:Questions and Answers/@comment-5.55.171.112-20140215105311/@comment-88.0.158.124-20140218175724

The DLC will surely work with the digital version of the game, and the save data will work, you can download the game and you won't lose your save as it's in the PS3 itself, not the disc (sorry I can't spell that word properly). So, yeah, you can get the digital game and don't lose your progress. Most likely.