A brand-new trailer released for Princession Orchestra today previews more of the original magical girl anime and its theme songs ahead of an April 6 broadcast, while also confirming four additional cast members. The series previously revealed that anime will broadcast for four consecutive cours (approximately a year).
Princession Orchestra Anime Trailer 3
The newly announced cast also includes:
Seishiro Sorano voiced by Satoshi Hino
Yoko Sorano voiced by Yoshino Nanjo
Riku Sorano voiced by Yuki Wakai
Natsu Hinomoto voiced by Akari Aimura

With an original concept by Akifumi Kaneko (Symphogear) and character designs by Mari Shimazaki (Luck & Logic), Shin Onuma directs Princession Orchestra at studio SILVER LINK. alongside Manta Aisora as series composer, Yukiko Akiyama as animation character designer and Elements Garden as music composer.
The story is set in the magical kingdom of Alicepia, a wonderland that has existed since ancient times and that is somehow connected to the Alicepia Channel video sharing website in the human world. When the Alicepians encounter a new threat known as the Jamaock, a trio of “princesses” step up to save the day with the power of music.
Source: Comic Natalie