Japanese computer graphics magazine CGWORLD 2010 has an in-depth look on the textures of Square Enix’s recently released (in Japan) Final Fantasy XIII.
The magazine isn’t solely dedicated to the game, but in the portion it covers, you’ll get a glimpse at Final Fantasy XIII‘s development schedule from 2005 to the final product, via a time line. It details how after the Final Fantasy VII tech demo for PS3, Square Enix then switched development of Final Fantasy XIII — which was on PS2 at the time — to PlayStation 3.
When development first began, the game was using the White Engine. Square Enix later changed the engine to Crystal Tools so they could create a custom engine just for Final Fantasy XIII.
A few scans can be seen below. Thanks to Siliconera for the info.