It depends on what you mean by DLC.

They have stated they will complete the game and anyone who has bought it now will have the full game. Any updates are free. Some people consider updates as downloaded content... DLC in that regard is free.

Once the game is "done" I would expect some cosmetic DLC for people who want to support the devs. The way they have done things so far I wouldn't expect to be charged for any game changing content.