According to this twit Kalafina will sing one more Ending Theme for the documentary Rekishi Hiwa Historia. This time its titled into the world . . Here is the video included:
Kalafina in the past has sang 4 more ending songs for it: storia, symphonia, yume no daichi, far on the water. Yuki Kajiura is composing the soundtrack, 3 OST discs with original music are released so far, while old musics from her older works are also used in the show.
thanks to elcazador for the news!