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Yeah, it seems more likely that it's just the next game in the Shining series, and the "Ark" part of the name is just coincidence. Heck, it's even possible that it's not a Shining series game at all, though I think Sega would try to avoid the confusion of giving a non-Shining game a title like that.
Still, would be an interesting surprise if they were making a remake or sequel.