We've got new and improved rules for stealth, new mission types (THREE BOMB! Base Defense! HEIST!), new terrain effects, lots of new nautical baddies to fight, loads of new rooms.
Seriously, I'm so excited about this expansion. Not only does it expand on the base game, it also fills in some of the gaps and just makes for an all-around richer experience. If you like Cyberrats, you'll LOVE this!