I found most of the information on fanpost.com
The news was also confirmed on the official Uta Pri Twitter page

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The third season of Uta No Prince Sama revealed that there is going to be another season and now the details are starting to come in.

The new season will be titled as....

Uta no☆Prince-sama♪ Maji Love Legend Star

It will be aired somewhere in October 2016. The staff will be the same except The staff is mostly the same with the addition of Sayaka Konno working on the series composition alongside Konparu while Maki Fujioka who previously worked on Ookami Shoujo to Kuro Ouji is on board to work the character designs and as the chief animation director, a change from the previous season where Mitsue Mori handled both positions.

Characters and Voice actors:

Miyuki Sawashiro as Haruka Nanami
Takuma Terashima as Otoya Ittoki
Kenichi Suzumura as Masato Hijirikaw
Kishô Taniyama as Natsuki Shinomiya
Mamoru Miyano as Tokiya Ichinose
Junichi Suwabe as Ren Jingūji
Hiro Shimono as Shō Kurusu
Kousuke Toriumi as Cecil Aijima
Showtaro Morikubo as Reiji Kotobuki
Tatsuhisa Suzuki as Ranmaru Kurosaki
Shouta Aoi as Ai Mikaze
Tomoaki Maeno as Camus
Yūichi Nakamura as Ringo Tsukimiya
Koji Yusa as Ryūya Hyūga
Yuka Imai as Tomochika Shibuya
Norio Wakamoto as Shining Saotome.

Hikaru Midorikawa as Eiichi Ootori
Daisuke Ono as Kira Sumeragi
Tsubasa Yonaga as Nagi Mikado
Yuuma Uchida as Eiji Ootori
Hidenori Takahashi as Van Kiryuuin
Ryouhei Kimura as Yamato Hyuuga
Daiki Yamashita as Shion Amakusa
Tomokazu Sugita as Raising Ootori

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Anyone excited?! I know I am! Who do you think will win for the entry song of the SSS competition?

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Stay tuned for more updates

(Yes, I know this is not the news but it's fun saying it)