There's hot seat multiplayer gameplay (I assume you just can't cheat by looking at what resources other people have), or a few AIs to tangle with if you don't have friends at hand, and the game includes a scrollable board to play on, game stats to track, and a tutorial for those of you who haven't rolled the dice and tried to build the Longest Road yet.
The game is created by United Soft Media, a German company that's also ported the game to the DS, and while it's not quite as shiny as the Xbox Live port (my personal favorite version of the game, outside of the real thing, of course), the reviews on iTunes say it gets the job done, at least while you're waiting for the next board game night (and while we're talking about board games, can I recommend Dominion? Best table game I've played in years). The game is $4.99 and available right now. Anyone have any ore?