According to the Aniplex
Project and Angel Beats! New Information Press Conference on Nico Live
today, an original anime titled Charlotte
will air in 2015. The main staff was announced, and more information will be announced at a later time.
Original Work, Script: Jun Maeda
Original Character Desgin: Na-Ga
Studio: P.A. Works
Announcement PV: https://www.youtube.com/watch?v=haR7oErj7kg
Official site: http://charlotte-anime.jp/
Update December 30
Dengeki G's February 2015 issue announced further details about the upcoming Key x P.A.Works anime. The story will focus on four characters in the student council, one of which is a member of one of two bands in the series. The songs sung by the bands will be rock, and the vocalists will be female. Unlike Angel Beats!, the characters' seiyuu will sing for their characters. Jun Maeda will produce all OP, ED, and insert songs for the series (composition and lyrics). The story be somewhat similar to Angel Beats!, but will focus more on each character. The first half the series will be calm, and then it will progress with vigor.
Two characters were also revealed: Yuu Otosaka, who looks like an A student but is not good at studying; and, Nao Tomori, the student council president who is very firm and studious, but has behavior problems.
Update January 29
The March issue of Dengeki G's magazine revealed more character information. It seems like the characters have superpowers, but they are not used for battle.
Yuu Otosaka: For five seconds, he can control any body. He uses his power to cheat via honor students.
Nao Tomori: She can disappear, though it is limited to certain people.
Joujirou Takashou: He can instantly move from one place to another, but cannot stop in the middle of the move.
Yusa Nishimori: She can possess only her sister, Misa, to perform spiritualism.
Four of them are on the student council. Their special powers are activated only when "certain boys and girls reach adolescence." The school "Hoshi no Umi Gakuen" is a special school for understanding special powers. The student council uses their special powers to take care of problems caused by other students with special powers. Takajou is almost the same as Takamatsu from Angel Beats!. Saitou, Key's fooling-around character, also appears in Charlotte.