Kingdom Hearts recently joined an elite group of franchises, its three games now accounting for more than 10 million units shipped worldwide. Still dwarfed by a pair of Nintendo franchises, Kingdom Hearts is nonetheless quickly establishing itself as one of the most successful series of all time.Consider that it's older sibling Final Fantasy -- ranked third among the all-time best-selling franchises -- has managed to move 68 million units; a tall stack indeed, but one that's built on 12 core games dating back to 1987, plus countless spin-offs, remakes, and compilations. To date, Kingdom Hearts (technically considered a FF spin-off) is built on a mere 3 titles; none of which have gone multi-platform (GBA's Chain of Memories will be released for PS2 in an upcoming re-release compilation called Kingdom Hearts II: Final Mix +). Kingdom Hearts debuted in September 2002.
Appropriately, Square Enix will soon unveil multiple Kingdom Hearts sequels, affirming that this action-RPG is one of the most sought after series in the business. So which platforms will be blessed this time around? Is the primary series' successor safe in Sony's hands?
