@Scottie
There isn't a pattern, actually, they are remaking the old FF's that only came out for Nintendo consoles at that time, so it's logical that they release the remakes on Nintendo consoles as well. If that logic prevailed on the minds of S-E then why didn't they make Crisis Core for the DS or Wii? It's because till FF6 and the Crystal Bearers saga all belong to Nintendo, and from FF7 onwards they were released on Sony consoles, and now FF13 is multiplat.
That being said, hopefully a remake of FF7 would be multiplat, so to maximize S-E profits, not counting out a Wii release as well with the HD consoles.
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