So far, PlayStation All-Stars Battle Royale has been light on DLC. The upcoming Kat and Emmett playable characters will be added (for free, initially!) on February 12th, but little else has been announced. That's why it was a bit surprising to see announcement of more DLC, especially considering developer Superbot has been hit by layoffs recently.
The newly announced DLC is for eighteen minions. In the game, minions are basically background characters as they do not actually impact fights in any way. Regardless, upcoming minions include Elena Fisher from Uncharted, Carmelita Fox from Sly Cooper, Ashelin from Jak and Daxter, and others. It's a bit disheartening to see some of these cool female characters relegated to relatively useless minion status, but that's the fault of the fighting roster itself.
One stage is also coming which combines Heavenly Sword and Wipeout. All of this is set to release alongside the Kat and Emmett update. No price has been given for the added minions and stage content.