I would definitly like to be able to play on the PS2/3. Hell, I'd buy the game for both systems if my progress from the PSP could be transferred to the PS2/3 memory cards (and preferrably vice versa), Imagine being able to play on the PS2 you already own, save and transfer your progress to your PSP, then (while carrying it around) you are able to load your progress onto someone's PS3 memory card and play their PS3 version of the game.

Naturally, I already expect them to release a sequel on the PS3. Square Enix likes to act as though their decisions are based purely on the reactions of their fanbase, but despite the so-so response it seems to have garnered, I'm certain Squeex with milk this "new" franchise for whatever miniscule tuppence it may be worth.