Witcher 3 will release on February 24th and from then on will receive free DLC each week totaling a wapping 16 pieces of DLC. the only catch is you need to buy the game, on any platform and or digital or physical. Whether you need to buy the game new or used is unclear but still an amazing gesture to the fans and gamers nowadays. I was thinking this game was a day one purchase but mixed, it has now become a sure thing for me. You can read their Q&A here
if your interested.