Downtown Sacramento has so many popular sushi destinations — Mikuni, Nishiki, Sakura, Zen.  Each Japanese restaurant has its own creative dishes, but most also offer only standard boiler plate menus of sushi rolls, teriyaki plates, and soup-based udon and sukiyaki.   John Voong, owner of Shabu Japanese Fondue, believes Sacramentans are hungry for change. "I see it this way.  It's a new concept here in Midtown," Voong said.  "Sacramento is ready for something like this." Shabu did a soft opening Nov. 30 to gauge diners' interest and it will continue until Thursday.  According to Shabu's Twitter page, the first night was a "great success" and boasted a "packed house the entire night."