The biggest change is to the Kith list. Originally, the list included 12 Kiths and their associated Kith Traits, in an effort to include as many options for customization as possible. The new Kith list includes 5 playable Kiths and traits, and a section was added to "Running the Game" that discusses how to create your own. More Kiths may be included in the future, but lowering the number makes for a tidier and more manageable list.

Changes
most of the original Kiths and Kith Traits removed
Kith list and Kith Traits updated and refined
"Customizing Your Game" heading added with "Creating New Kiths" as its current sole section