Right there are no large boards. In fact, we're regularly thanked for keeping the board and box size small. There are no plans to change this. I suppose you could buy the print & play version and print your own larger board if you really needed too.
I thought about that, and then I realized the cards and playing pieces would have to be bigger also!
And then I saw something about a Deluxe edition, and thought it would be the large, pimped-out version, but it still looks fun.
I'm much like Ariel. When I have something I like, I want morrrrreeeeeee (sorry for the Little Mermaid reference, no idea where that came from).