Just to expand on the Deluxe comments:
Anything that you see on the KS page marked with a D foil stamp means that it won't be in the retail edition.
In addition to the poker chips for currency, you also get:
1. Black-dyed chitboards (vs the regular greys)
2. Thicker 2mm player mats (vs a 1mm player mat)
Very much this.
If you can afford to, it's definitely in your interest to buy into the backerkit preorder to get the deluxe edition. In Brass, you're constantly handling your money & you need to stack it in a certain place on the board as you spend it, so the chips will be a very welcome improvement.