Square Enix officially announced Kingdom Hearts 2.5 Remix today, an HD compilation that includes Kingdom Hearts 2 Final Mix, Birth by Sleep Final Mix, and remastered cinematics from DS entry Re:coded. It follows the lead of 1.5 Remix by coming to PS3, and is due worldwide in 2014. There was no mention of a PS4 version in Square Enix's announcement.
2.5 Remix will mark western debuts for KH2 Final Mix and Birth by Sleep Final Mix, the respective PS2 and PSP games previously restricted to Japan. Both re-releases add many features to the original games, including new difficulty modes, mini-games, cut scenes, and a plethora of other tweaks.