The firmware that will be installed is the firmware that bkkcoins the developer of these open source boards is creating.
More information can be found here
http://github.com/bkkcoins/klondike .
So is that something my computer can/will send to the board(s) across the USB?
Or something I would need special cabling/kit in order to install it myself?
-MarkM-
Depending on what type of kit you buy it will come flashed onto the board. You just need to plug the USB and boot up cgminer etc.