The footage introduces the new “Style Change” system, in which enemies can only be defeated by fighting in a certain style. There are also dungeons that can only be unlocked with such styles.
Ys VIII: Lacrimosa of DANA is due out for PlayStation 4 in Japan on May 25.
Watch the footage below.
(Starts at 7:45, ends at 16:07.)
(Starts at 26:28, ends at 35:50.)
Thanks, Games Talk.