As I’m able to sit down and actually work this information up… (I had my hands full with a ton of other posts that needed to be done at the same time last night), allow me to give you all the information revealed for the anime series.
Studio: Kinema Citrus (Tokyo Magnitude 8.0, .hack//Quantum)
Original Work: Nihon Falcom – The Legend of Heroes Sora no Kiseki / Trails in the Sky
Director: Masaki Tachibana (.hack//Quantum)
Series Coordination / Screenplay: Uezu Makoto (Utawaremono)
Character Design: Nozaki Asako (Tokyo Magnitude 8.0)
It has already been confirmed that Kanda Akemi and Saiga Mitsuki will both be playing Estelle and Joshua, according to Comic-Gekkin. With that, it’s easy to assume that they fully intend to get the original cast, if at all possible.