Can Disney still use Steamboat Willie?

Could you please clarify for me, given the complexities of copyright law and the ever-evolving nature of the entertainment industry, whether Disney still holds the rights to utilize the iconic character and animation known as Steamboat Willie? I'm particularly interested in understanding if there are any legal constraints or expirations that may impact Disney's ability to leverage this beloved classic in their current and future projects. Additionally, are there any recent court cases or legal developments that could potentially alter the status quo regarding Disney's ownership and usage of Steamboat Willie?