Prepare for the fans of the game to come running to its defense. Their number one defense: you don't need to buy the dlc and the maps will be free.
Quoting the number one 'fans' defence doesn't make it any less valid though. Don't want to support the practice of paid character, skin and monster DLC? Fine, don't buy it. Future maps and game modes will be free to avoid splintering the player base (a great decision in my eyes) and you still get to play with and against those who do own extra content.