The world of Astoria is growing, and you want to be the one with the biggest hunk of cheese at the end (cheese meaning money in this case, though a literal giant hunk of cheese wouldn't be terrible, either). The Fat Cat Expansion for Raccoon Tycoon gives players more options and ways to build their economic engine. It also adds in enough pieces to add in extra players, so more gamers can get in on the fun. The new set is up on Kickstarter now.
From the campaign:
As you can see from the featured image, the campaign funded almost immediately. It's got 23 days left to go.