I'd go ps4 not ps3 as they usually take quite a while to develop anything (that development team) and next gen consoles are expected within the next 2 years ish; would make sense to have it on ps4 rather than release it for ps3 just as it's about to be superseded Edit: However HD collection seems more likely, faster to release AND will bring people who don't own all the consoles the series has spread itself across up to speed on wtf is going on :p
Next Kingdom hearts game is either KH:HD collection or KH3. Problly the HD collection since they said they wanted it to return to consoles and expressed interest in HD and Im betting KH3 is coming out for awhile.
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Edit: However HD collection seems more likely, faster to release AND will bring people who don't own all the consoles the series has spread itself across up to speed on wtf is going on :p