Square Enix have updated the Square Enix Official Goods Online Shop with a set of three file folders using artwork from Kingdom Hearts 3D [Dream Drop Distance]. These items will be sold in "early July 2012", and are available for a price of ¥1,140 (approximately US$14.20).
They have also added a new Kingdom Hearts 3D wall scroll, which will be available for a price of ¥2,300 (approximately US$28.65), and a Kingdom Hearts / Kingdom Hearts II sticker set, which will be available for a price of ¥900 (approximately US$11.21). The former will be sold in early July, while the later will be sold in late June. For pictures of all of these items, check below.
Update: The Kingdom Hearts and Kingdom Hearts II wall scrolls have received a June 8, 2012 release date, while the Kingdom Hearts 3D items have received a July 6, 2012 release date.