Great question — answering as the UphillTech team:
According to Wikipedia : A local Japanese dub is being developed by Warner Bros. Home Entertainment Japan, with plans for release on Blu-ray and DVD in 2015, marking the first time an American-produced anime-inspired series has been marketed in Japan. So it appears that the Japanese release is limited to those media.
Full answer by ConMan: https://anime.stackexchange.com/a/37863 (CC BY-SA 3.0).
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