UPDATE: It’ll be the Walt Disney World Wonders vs the Disneyland Dreamers. More info will be released on this event at a later date.
It looks like Disney could be preparing a March Magic-type event for the Fall called Fantasyland Football. Guests who have purchased March Magic merchandise received a card promoting the new event.
The url does resolve to this page with a “Fantasyland Football” page title: https://www.disneystore.com/fantasyland-football-limited-release-items/mn/1032414/
Nothing has been announced by Disney yet, so the details of the event still remain a mystery, but we enjoy the March Magic event, so we’re excited to see what Disney may have in store for this Fall!