http://www.eurogamer.net/articles/2017-08-23-mario-rabbids-kingdom-battle-reveals-season-pass
http://gematsu.com/2017/08/mario-rabbids-kingdom-battle-season-pass-announced
Mario + Rabbids Kingdom Battle is getting a Season Pass encompassing three pieces of DLC.
The first, and most minor of the group, is exclusive to Season Pass owners and available at launch. This DLC will add eight bonus steampunk weapons to the game, each with their own unique stats.
Later this autumn a second DLC will arrive, adding new solo and co-op challenge maps.
Finally, the game will receive a proper story expansion in 2018.
http://gematsu.com/2017/08/mario-rabbids-kingdom-battle-season-pass-announced
For $19.99, the Season Pass will include access to the following content:
Available at Launch 8 unique steampunk weapons will be available, each one with its own statistics. These items will be exclusive to Season Pass owners.
Available This Fall Players will be able to test their skills with new solo challenges, or with a friend, through additional co-op maps.
Available in 2018 Players will be able to play through brand new story content.