I'm also not too fond of the fact that this iOS title will be offered to gamers much like Final Fantasy IV: The After Years was offered to Wii owners--although in the case of Final Fantasy Dimensions, gamers will be able to download the prologue for free and then pay some currently unknown amount for each additional chapter.
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Still, I'm a sucker for sprite-based Final Fantasy games that feature robust job systems (side note: Final Fantasy V is my favorite mainline Final Fantasy title), so I'll probably pick this up day one if it's ever thrown onto the 3DS--or even Wii U--eShop.
That said, I'd much prefer to see the folks at Square Enix work up a 3DS version of its other mobile-centic Final Fantasy spin-off, Final Fantasy Brigade, which features an art style similar to the one found in my game of the year thus far, Theatrhythm Final Fantasy.