Battlefield 4 has already had a season pass but DICE aren't quite done with developing content for the game just yet. However, instead of charging players extra on top of all the other additional DLC costs already tied onto Battlefield 4, DICE has made the noble choice to release all of the future DLC content for free.
Whilst previous DLC will still cost players the same it does today, any new content created by DICE and released for Battlefield 4 from this day forwards will be absolutely free to all players.
So far there are a lot of details that haven't been shared by DICE, but we do know that they are working on some new maps, including night time maps. The night maps should be variants of previously released maps. So far we already know that Siege of Shanghai, Zavod 311, and Golmud Railway will be receiving nighttime variants. A new community-made map is also in the works and should be released for free in the not too distant future.
A new patch is planned for this Spring and it will come with some new content too. As well as fixing up some bugs, the Spring patch will add in five new weapons and the Gunmaster game mode.
For those new to the Battlefield series, Gunmaster plays out just like other Gun Games. You'll start with one weapon and each kill will reward you with a new weapon. There are seventeen weapons to get through until you finally get given the knife. A knife kill will end the game.