You read the title correctly. Nier: Automata has released more content today via DLC. “3C3C1D119440927” (the name of the new DLC) has new sidequests, costumes, random items, and coliseum battles.
The DLC can be played by those who have already completed part C and D, and unlocked the Chapter Select Function. You are then able to battle Square Enix exec Yosuke Matsuda and Platinum Games head Kenichi Sato for awesome prizes.
Here’s a video of the DLC gameplay below: