We just released the first DLC for the game - 1849: Nevada Silver. It's available now.
Some of the new features:
- Builds on 1849's simulation gameplay with added difficulty
- Six new Nevada city scenarios, from frontier outposts to bustling boom towns, plus sandbox mode
- Train-based trading system adds a new strategic dimension
- New buildings, mines, and resources based on the industry and technology of the era
Link to the DLC: http://store.steampowered.com/app/320900/
Enjoy!