Now, wouldn't you know it, Ubisoft is planning to capitalize on its positive reception by releasing the game's first DLC, the "Ultra Challenge Pack".  There's some single player content in there, which revolves around a few extra difficult levels for you to sink your teeth into.  More importantly, though, the DLC contains "Cataclysm Kerfuffle", a two player local co-op campaign consisting of five new maps, each with their own harder version to unlock.

The three things that Ubisoft outlined/teased in their blog post for post-launch content are eight "Steampunk" themed weapons that will be available at launch, new solo and co-op challenge maps, and "unexpected story content." The challenge maps will be released sometime this fall, while the new story content won't drop until sometime next year. All of this can be yours if you pick up the Season Pass, which will be available on launch day (August 29) in the Nintendo eShop for $19.99. Considering the game itself is a bit of an unknown quantity at this point, this means you're essentially paying $20 for content for something sight-unseen, so you might want to wait just a bit before grabbing that.

The two player local co-op mode in Mario and Rabbids Kingdom Battle is completely separate from the single-player campaign. The devs describe it as a challenge mode where players choose a challenge, such as defeat a certain number of enemies within a set period of time, or make it to a certain objective point, and then each player chooses a team of two characters. Different characters have different special abilities, like Luigi being good at long-range shots or Rabbid Peach being able to heal teammates, and each player can also choose a weapon loadout for each character in their team. Players are also able to level up the abilities of each character. It's not specifically discussed in the video, but it seems that both the weapon loadout and ability upgrades are tied to the progression in the single-player campaign.

Update: Earlier, we reported that the two player local co-op would include co-op in the campaign. This has since been clarified and the co-op will only be in specific challenges. The main campaign will be single player only.