Epic Mickey was a short-lived franchise that debuted on the Wii, and then saw a follow-up on the Wii U. That second game came out in 2012, and we really haven't heard anything about Epic Mickey as a brand since. That's what makes today's listing so odd.
A dutch Funko POP! website has added the t-shirt listing you see above. It certainly seems odd to add a new Epic Mickey-themed bit of merch in 2020, after so many years of radio silence. Some people are taking this as a hint at something more to come from the Epic Mickey brand, be it a new game, a re-release, or something else. Of course, that's all speculation for the time being. We'll just have to hang tight and see if Disney has anything to announce.