Kingdom Hearts’ Keyblade will make a cameo appearance in Disney Infinity 3.0. You will have to work for them though as you first have to collect all the Disney Infinity figures and unlock them in the Hall of Heroes to gain access to the Keyblade from Kingdom Hearts.
Announced at the D23 Expo, attendees also obtained a special power disc that unlocks Mickey Mouse’s Kingdom Hearts outfit and will not be sold at retail. Although, the last D23 Expo gift for Disney Infinity players was Mickey Mouse in his Apprentice outfit from Fantasia which later went on sale.
— Disney Infinity (@DisneyInfinity) August 16, 2015