Famitsu has an interview with Tetsuya Nomura this week and they asked him straight out if a HD version of Kingdom Hearts II would come afterwards. Nomura said to the magazine it would be unusual if it didn’t.
Kingdom Hearts HD 1.5 Remix has Kingdom Hearts, Kingdom Hearts Re: Chain of Memories, and movies from Kingdom Hearts 358/2 Days in a theater mode. Square Enix is recording new voice work for theater mode, 70% of the main plot will be covered.
Instead of upscaling the models, Square Enix is using the Kingdom Hearts 3D model for Sora as a base for Kingdom Hearts HD 1.5 Remix. The gameplay, according to the magazine, has been overhauled to play more like Kingdom Hearts II.