A new heist, new masks and a free update (If I'm not mistaken) adding the ability to save your builds and switch back and forth between them.
+The heist is a lot quicker and simpler then others. I still enjoyed it and having almost every room connected to each other with corridors and a garden in the middle made the gameplay very fast paced and fun. Thought it was good.
+4 new masks. Mythical creatures, I like it.
No new guns sadly there is the free update too adding the ability to switch between your different skill tree builds which is a nice addition. People have complained a lot about the price I suppose it was more expensive in the past currently its listed for 1.99 USD, similar to other old DLCs. I got it in a package deal years ago so I don't mind it.