From the back cover:
Out of the depths of wildspace come astonishing new ideas for SPELLJAMMER campaigns. Now you can create player characters from the nonhuman races of the giff, dracons, scro, grommams, and more. Equip your characters with kts like the Corsair, War Mage, and Aperusa. Then add some new space-oriented proficiencies and equipment, enlist your character in a spacefaring organization, and head off into the Void.