https://www.reddit.com/r/vita/comments/4jpp40/star_ocean_producer_you_dont_need_ps_vita_games/
Star Ocean 5 producer Shûichi Kobayashi recently had an interview with French fan sites Final Fantasy World, Final Fantasy Dream and DB-Z. Though I won't translate the whole discussion because it's not relevant to this subreddit, there is a part about Star Ocean 2 and PS Vita that... Well, it says a lot about Square Enix and the Vita in the West:
FFW : You released Star Ocean: The Second Story on PS4 and Vita last year in Japan, and I would like to know if you plan to do the same in the West.
Kobayashi : Actually, I'm not the producer of Star Ocean: The Second Story, so this decision isn't mine. But I think it would be great to release it worldwide. I can talk with the producer, if you want it. But you don't need the PS Vita version here, do you?
FFW : Well, players often complain that Square Enix doesn't publish any game on PS Vita in Europe.
Kobayashi : Really? I didn't know that. The best would be to release on both platforms of course. I'll discuss about it as soon as I can.
Full interview (in French): http://ffworld.com/?page=article&id=81