Just one thing, it's Disney Interactive Studios now, not Buena Vista Games.
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The cutscenes in 358/2 Days are pre-rendered, they are not using the same graphical engine as the actual gameplay, which means that they are not limited by the graphical capabilities of the in-game graphics, they are able to make cutscenes as highly detailed as they wish.
KH2's opening and ending cutscene were also pre-rendered, hence why they looked much better than the actual gameplay itself, because they used CGI rendering for the scenes.
So, 358/2 Days important cutscenes will be pre-rendered with PS2 quality graphics and with voice-acting, and the less-important cutscenes will be using the in-game engine and will most likely use Text Boxes.