Anime Expo, an anime convention in Los Angeles, have announced that Yuki Kajiura (.hack, Tsubasa: RESERVoir CHRoNiCLE, Noir) will perform keyboards for her FictionJunction project along with a "special guest vocalist."
Who that vocalist is and the exact date of the concert is not yet known.
Anime Expo has already announced special guests of the convention singer LiSA and TV host and blogger Danny Choo.
Source: Anime News Network