Congrats.
Who knows...you may have been originally drawn for a night at Cinderella's Castle. The contest rules contemplate that entries from the mail-in pool drawn for an "in-park" prize such as a night in Cinderella's Castle will be substituted...Excerpt below:
"...Potential winners from the mail-in entry pool will be notified by mail or telephone (at Sponsor's sole discretion) within approximately fifty five (55) days after each monthly drawing. If a prize requiring winner to be present at a Disney Property is designated for award (such as a DREAM FASTPASS badge or the one-night stay at the Cinderella Castle Suite), a winner entering via mail will receive an alternate prize of comparable or greater approximate retail value as determined by Sponsor in its sole discretion, such as a special edition pin and lanyard, a special edition Dream Mouse Ears or a merchandise gift basket (which may include a Disney Gift Card)."