Disney D23 is an official Disney fan club that was founded in 2009 and is sponsored by the Walt Disney Company. This year, they are holding the event in Japan, and will feature exclusive KH content!
Don't get to excited, as there has been no mention of the sort on future titles, but Mr. Shinji Hashimoto (Producer) is set to appear, along with several Voice Actors from the series. The event known as the "Kingdom Hearts Fun Event," will be October 14th 2013 from 3-4 PM.

Credit for the news find goes to Roxam.