If you remember, during the end credits of Kingdom Hearts 1.5 HD ReMix we were able to see some screenshots from Kingdom Hearts II, Kingdom Hearts: Birth by Sleep and Kingdom Hearts: Coded. Square Enix was teasing Kingdom Hearts 2.5 HD ReMix, which was released yesterday in Japan for PS3 and includes the games previously mentioned.
Now, during the end credits of Kingdom Hearts 2.5 HD ReMix we can see screenshots from the only KH game without an HD remake so far: Kingdom Hearts 3D: Dream Drop Distance, which was released in 2012 exclusively for Nintendo 3DS.
We already know that Square Enix is considering the HD treatment for KH 3D, but the fact that scenes from the game have emerged in KH 2.5 HD Remix could be a clear indicative of this being real.
By the way, take a look if you want to the secret movie after the end credits of KH 2.5 HD ReMix (spoiler alert!):
Via | Gematsu