Soul Sacrifice will be supported by lots of extra content through 10 free bosses to expand the length of the game. Details on how these bosses will play out is unknown but hopefully it shall be an interesting add on.
Sony plans on having additional episodes to be sold as DLC expanding the game even more. These will be available after the games launch.
Soul Sacrifice releases on PlayStation Vita in Japan on March 7th, April 30th in North America, and May 1st in Europe.