Sinister Sundown from the Kingdom Hearts Piano Collections is the standout here. Taking that tense Twilight Town atmosphere and translating it into solo piano gives it this elegance that the original synth version only hinted at.
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Flash from FFXIII previewed what Masashi Hamauzu was cooking for that game's combat, all sharp strings and relentless forward momentum. The FFXI Wings of the Goddess trailer music captures that MMO grandeur, cinematic and sweeping.
Crystal Bearers brings a lighter, more adventurous tone compared to the original Crystal Chronicles. Short tracklist, very 2009 in its selection. A time capsule of where Square Enix was headed right before the PS3 generation fully took over, and the piano work alone makes it worth tracking down.