An unholy host of alternate systems for you to option into your characters and games, including (but not limited to!) Morality, Virtue/Vice, Merits, character creation.
Brand new systems for you to incorporate: social and mental combat, miniatures combat, relationships and Rapport, Conviction, Insanity, and don't forget to check out the Extraordinary Mortals template (with built-in Skill Tricks).
Three new "what-if setting hacks" for the World of Darkness. The World of Darkness Revealed, wherein the monsters stand exposed for all humanity to see; The World of Darkness Destroyed, which gives you the option of playing out the global apocalypse; and The World of Dark Fantasy, a fantastical spin on the system and setting.
A handful of essays from the writers and developer of this book, bringing you their own personal "house rules" and hacks for you to consider.