The official Twitter account for the Symphogear franchise revealed on Saturday that Nana Mizuki will return to perform the opening song for Senki Zesshō Symphogear XV, the upcoming fifth season of the anime. Mizuki performed the opening song of all four seasons so far, and also voices the character Tsubasa Kazanari in the anime.
The Twitter account also revealed a new teaser visual for the anime on Friday.
The anime will premiere in July, delayed from its original April premiere.
The Senki Zesshō Symphogear franchise premiered with a 13-episode television series in January 2012. The second television anime, Senki Zesshō Symphogear G, followed from July to September 2013, and the third television anime, Senki Zesshō Symphogear GX, aired from July to September of 2015.
Senki Zesshō Symphogear AXZ, the fourth season, ran from July to September 2017. Katsumi Ono, director of the second and third Symphogear anime, returned to direct the fourth series again at Satelight. Elements Garden handled the music once more, and Akifumi Kaneko and Noriyasu Agematsu are credited as the original creators.
Source: Symphogear franchise's Twitter account (link 2) via Ota-Suke