It was announced during AnimeJapan 2015 that the Aquarion franchise will be receiving a third series, Aquarion Logos, and a special OVA to commemorate the 10th anniversary of the series. The OVA will be a crossover of the first two Aquarion series, Sousei no Aquarion and Aquarion Evol, aptly titled Sousei no Aquarion Evol. Both anime will premiere in Summer 2015.

Aquarion Logos Synopsis
In a world where social networks have greatly expanded in society, we use words that don't mean anything to us. However, in the world of Logos, these words have caused irregular incidents that affect the real world. The Sousei (Voice of Creation) group and Akira Kaibuki face the danger of the world while trying to solve the meaning of these words. What will be the newfound power if these words meet Aquarion? The new age that has reached 10 years of coexisting with robots is starting!

Cast
Akira Kaibuki: Nobunaga Shimazaki (Date a Live)
Maia Tsukigane: Ayane Sakura (Boku wa Tomodachi ga Sukunai)
Kokone Kikogami: Haruka Chisuga (Shirobako)
Hayato Kujou: Yuuichirou Umehara (Binan Koukou Chikyuu Bouei-bu LOVE!)
Tsutomu Domon: Takayuki Asai
Karan Uminagi: Ari Ozawa (Gekkan Shoujo Nozaki-kun)
Subete Kenzaki: Yuuto Adachi (NEVA GIVE UP vocalist)

Primary Staff
Director: Eiichi Sato
Assistant Director: Daisuke Tsukushi
Series Composition, Script: Jun Kumagai (Hamatora the Animation)
Script: Ayana Yuniko, Mariko Mochizuki
Character Design, Chief Animation Director: Takashi Mamezuka
Chief Animation Director: Ayana Nishino
Music: R.O.N (Kuroko no Basket)
Music Studio: flying DOG
Sound Director: Youji Shimizu (Redline)
Sound Studio: Kaga Electronics, Tohokushinsha Film Corporation
Animation Studio: Satelight, C2C

Opening Theme Performer: May'n (Blood Lad)
Ending Theme Performer: Haruka Chisuga (Shirobako)

Official site: http://aqlogos.com/
PV: https://www.youtube.com/watch?v=szjAot0GEQM

Sousei no Aquarion Evol will be premiered at the Aquarion 10th Anniversary event on June 28, 2015. The Blu-ray box for Aquarion Evol is set to release on June 24, 2015.

Cast
Shin Tsukishima: Jun Fukushima (Yowamushi Pedal)
Yuno Kawazu: Yui Ogura (Hentai Ouji to Warawanai Neko.)
Amata Sora: Yuki Kaji (High School DxD)
Kagura Demuri: Kouki Uchiyama (Nisekoi)
Mikono Suzushiro: Ai Kayano (No Game No Life)
Zessica Wong: Kana Hanazawa (Durarara!!)
MIX: Ayumi Fujimura (Kaichou wa Maid-sama!)
Cayenne Suzushiro: Kenichi Suzumura (Kara no Kyoukai)
Andy W Hole: Kousuke Toriumi (Prince of Tennis)
Donar Dantes: Junichi Suwabe (Fate/stay night)
Apollo: Takuma Terashima (Log Horizon)
Silvia de Alisia: Yumi Kakazu (Stand By Me Doraemon)
Reika: Sanae Kobayashi (Baccano!)
Zen Fudou: Unshou Ishizuka (Cowboy Bebop)

Primary Staff
Supervisor, Original Creator: Shoji Kawamori
Director: Kenji Yasuda (Shugo Chara!)
Assistant Director: Daisuke Tsukushi
Script: Mariko Mochizuki
Character Design, Animation Director: Takako Shimizu
Music: Yoko Kanno, Hisaaki Hogari, Ayako Otsuka
Sound Director: Youji Shimizu
Sound Production: Kaga Electronics, Tohokushinsha Film Corporation
Studio: Satelight, C2C

PV: https://www.youtube.com/watch?v=uZrWpmKaWzs

Source: Nekonotemo 1, 2

Aquarion Logos & Sousei no Aquarion Evol on MAL