http://www.famitsu.com/news/201506/30081975.html
http://dragon3.sega.jp/
There's basically no info on this other than its October 15th release date and a livestream set for July 4th.
Imageepoch developed the DS and PSP games, but they're dead and no studio is listed. Perhaps Sega hired on some former staff to finish up Stella Glow and then work on this? Hope this works out better for Sega than that game did lol
edit:
Director: Masayuki Kawabata
Producer: Juro Watari
Scenario Writer: Sou Yoda
Character Designer: Shirow Miwa
Composer: Yuzo Koshiro
Theme Song: sasakure.UK