Disney still has over half a year to fuck with copyright law (again). Don’t count your mice before they nut.

Also: Only the Steamboat Willie version of the character will be in public domain. The later Mickey artwork will not. (There were 4 Mickey cartoons in 1928: Plane Crazy, Gallopin' Gaucho, Steamboat Willie, The Barn Dance. They'll all enter the public domain.)

And Disney still has trademark rights. So any art, books, etc. done with the character will need to clearly state "not authorized by Disney" to make it clear you're not trying to draw on their trademark.

But House on Pooh Corner joins it them in the public domain, so bring on the Steamboat Willie/Tigger slash comics. Or coloring books. Make a kickstarter and sell them.

Also entering public domain:

• Lord Peter Wimsey & the first set of stories about him
• John Brown's Body (poem)
• All Quiet on the Western Front
• Lady Chatterley's Lover
• Charlie Chaplin movie The Circus
• 12 Laurell & Hardy shorts, including "From Soup to Nuts"
• "Big Rock Candy Mountain" - song
• "Mack the Knife" - song