@MattStickman Hey Matt! We've been getting some similar reports, but I am certainly positive this isn't a bug; it just takes a little longer to load the DLC because of the assets! Make sure you have a reliable internet connection and try again, but keep the screen awake as you wait. This can take up to several minutes, unfortunately. We do have an update that's been submitted to the App Store for review that should cut down on this time a little, so keep your eyes peeled!
Also, once you have done the initial wait for the first time you load the game, it will load much quicker the next time!