I believe this was "Kingdom Hearts Chi" or whatever the name is. I don't know all the details of the game, but it's a PC game only released in Japan and has something to do with the Keyblade wars.
To be honest, I would've rather had KHDDD on 2.5 than re:coded. Re:coded was alright, but KHDDD would've been better for catching people up. One of the main marketing things for 1.5 and 2.5 was so people who haven't been around the past few years can catch up before the release of KH3, and I feel like re:coded won't help them as much as KHDDD would.