From the update:
We are excited to announce the immediate release of THREE new Add-On Packs! You can "over-pledge" now for the dollar amount of Add-On Packs that you wish to add to your order, but you won't be able to select any of these Add-On Packs inside the Kickstarter system. We will get all your order details after the project closes via our Pledge Manager.
The Accessory Pack is an especially amazing deal.