With the new rulebook that is available on the support section we can now confirm that all promos from "Blue Moon" will be in the box.
The four spirit are included and there is 296 people cards.
So if we calculate
The 8 original people have 32 cards + 1 Leader for a total of 33 x 8 = 264
And the Buka comes with 30 cards + 1 Leader + the promo "Sea Moon" for a total of 30 + 1 +1 = 32
Thus giving us 264 + 32 = 296.
I can't wait to get the game and finally be able to make a custom deck against a friend since I own the original.