From the announcement:
At Gen Con 2013 we'll be introducing the first Convention Exclusive Item card for Endless: Fantasy Tactics, "The Penultimate Weapon." This 100 copies of this Item will be avaliable at our booth(#652), 25 will be handed out each day of the show by our Wardens. Just stop by and ask for a demo of Endless, or if you already know how to play ask our Wardens for a quick match.
Can't make it to Gen Con? Thats okay! We'll be bringing the Penultimate Weapon to any show we attend, and Wardens will be able to hand them out at store events.