Disney trademarks Castle of Illusion, but M-I-C-K-E-why?

Disney has put in a new trademark request for the term "Castle of Illusion," which presumably refers to the old Sega Genesis game, Castle of Illusion starring Mickey Mouse. The trademark is specifically targeted at video game software.

We're not sure what Disney intends to use this trademark for, if anything. It could be a brand new release also set in the castle that Mickey platformed through while trying to save Minnie, or it could be a re-release of the old game on a new platform, like Virtual Console release or even iOS. Whatever its release plans, Disney is apparently laying out the legal groundwork for something.