Square Enix seems to release a whole arsenal of Final Fantasy XIII related soundtracks. They even have a Japanese portal for all of their 4 FFXIII soundtracks so it isn’t unthinkable that the Piano Collections album will be announced there rather sooner than later. vgmdb (Video Game Music Database) leaked the first information about the upcoming Piano Collections album for Final Fantasy XII.
The album will be released on the 21st of July this summer for a mere 2800 JPY. It will be arranged by FFXIII composer (Masashi Hamauzu) himself and performed by Aki Kuroda, known for her contributions to the FFX Piano Collections (also arranged by Masashi Hamauzu and performed by Aki Kuroda).
Aside from Final Fantasy XII, every Final Fantasy game got their Piano Collections album featuring arrangements especially for piano. The Final Fantasy XIII soundtrack was received with a lot of praise and fans will be happy to hear that a piano collections album is releasing soon.