I highly doubt this will be for MK because of the FAA no-fly restrictions over the park.
Those restrictions prohibit any aircraft from flying 3000 feet or lower in a 3 mile radius centered near the MK (the flight restrictions do not cover the entire WDW property, so it could still be for the other 3 parks)
The FAA regulation does allow Disney to apply for a waiver for its own aircraft for "operational" purposes. Not sure a flying dragon would be considered "operational". But even if it was, I imagine Disney flying aircraft in the zone would renew opposition to the restrictions and invite a review of its necessity (Disney lobbied for the flight restrictions after 9/11 under the guise of security, but they also acknowledge it keeps banner planes from flying over the park. Now that Disney has what it wanted, I doubt they'd invite new scrutiny over the questionable restrictions)