From the Kickstarter:
Grim World is a dark fantasy supplement for the Dungeon World and Fate Core systems
7+ Dungeon World class playbooks
6+ Fate Core classes, with theme descriptions, aspects, and stunts
15+ Playable Species with custom moves, free aspect invokes, and portrait illustrations
Grim World setting tips and GM philosophies
The Hunt faction details about their structure, hidden caches, lodges, hunting trophies and contracts
8+ DW style Compendium Classes to flesh out your characters
7+ GM Fronts/Arcs for building a campaign
Grim World locations and the Grim World Location Builder (roll some dice for an instant adventure location)
20+ Monsters with descriptions, instincts, weaknesses, and portrait illustrations
Loads of gear including new magic items, cursed items, and a Cursed Item Toolkit (to build your own cursed magic items)
36+ (yes, 36 and counting!) additional Death Moves, including all standard DW classes, Inverse World classes, and tons for other custom classes (written by Jacob Randolph and other awesome contributors from the community)
Full page class illustrations, spot illustrations (for species, monsters, magic items), and additional icons and sketches, all to make Grim World come alive!