The official site for Shining Hearts ~Shiawase no Pan~ has listed additional cast members. The anime series will premiere this April.

The seiyuu cast:

• Houko Kuwashima as Kaguya
• Hikaru Midorikawa as Ragnus
• Yui Horie as Rufina
• Ryou Hirohashi as Rouna
• Chiwa Saito as Xiao-Mei
• Rie Kugimiya as Melty
• Tomoko Kaneda as Sorbe
• Kazuya Nakai as Dylan
• Hiroshi Kamiya as Alvin
• Masaharu Satou as Hank
• Hiroko Emori as Madera
• Izumi Kitta as Queen

Previously mentioned seiyuu cast:

• Hiroshi Kamiya as Rick
• Kanae Itou as Amil
• Mai Aizawa as Neris
• Shiori Mikami as Airy

Yui Horie? OH MY. So on my watch-list :D

Source: ANN