In preparation for the new game in the Ys series, Ys Celceta: Sea of Trees, Falcom had a built prepared for the Tokyo Game Show. The demo contains two section of the game: one on field and another partaking in a boss battle. The screens below are from both demos and are a preview of the overall world and a boss fight.
Ys Celceta: Sea of Trees will be available tomorrow on the PS Vita in Japan, there has been no announcement made for a localization.
Source: Siliconera (http://www NULL.siliconera NULL.com/2012/09/26/i-fought-ys-celcetas-giant-fish-boss/)