As explained in the market here, the Steamboat Willy copyright is expiring at the end of 2023, meaning that starting 2024 creators can portray this incarnation of Mickey Mouse however they like.

The same thing happened in 2022 to Winnie the Pooh, and shortly afterwards the slasher film Winnie-the-Pooh: Blood and Honey was announced (to be released later this year).

This market will resolve Yes if within 1 year of the Steamboat Willie copyright expiring (i.e. between 1/1/2024 and 1/1/2025) a slasher film or other similarly bloody movie, prominently starring Mickey Mouse is released.