It's the same Stealth Illigetimate Child with a fresh new trick.
Teleporting feels both fresh and fitting in the game and I found myself having to completely rethink how the game works at some points. Teleporting works by using these 2 little little capsule devices (which can be thrown) and then swapping between them with the press of a button. The in game execution is simple enough, but the game amps up the difficulty and makes this an "easy to learn but hard to master" mechanic. To go along with this new tool, the DLC adds completely new set of levels for you to play on.
This DLC offers a nice bit of challenge and a nice new mechanic to an already solid game. I highly recommend it if you liked the base game, and want a challenge.