Square Enix has officially opened their Jump Festa 2012 page on their Japanese site, with Kingdom Hearts 3D having their own section with a few pictures and caption to go on there. As with Tokyo Game Show, they'll be adding more to it as Jump Festa begins in December.
Jump Festa will be held in Makuhari Messe on December 17th and 18th. We'll let you know when this page updates!
Translations of the caption on the page have been done by Tgirl and Oishii:
The protagonists, Sora and Riku, jump around alternatively as they make their appearance in the newest "Kingdom Hearts" series addition for the Nintendo 3DS! So please stop by, in Jump Festa, and get ready to try out the demo and enjoy the new world(s).