In case anyone hasn't checked the updates on the site, you can pledge for up to 12 decks - AND for whatever other add-on items you want (that aren't already sold out, of course). Peter got a "ruling" from Kickstarter regarding this. They stated he can give only up to twelve of the item that's being created in the Kickstarter project, but that the other items like posters, stands, etc. are not limited in that way.
Fully funded and STILL going strong! Boo-yah!