There's 5 months left in the entire year, and we don't know the release date of the game in their "main" region yet, let alone another one. I think people are right to be skeptical, regardless of what's been said.
In terms of overall project, I'd imagine there'd be more work for something like a modern Persona game than a modern SMT game(more voice acting, just more script in general). There was a short gap in between SMT4's release in the regions, and it would be really remarkable to imagine a shorter gap in this situation. Of course this doesn't mean it's not coming in 2015 at all, but the window is getting narrower by the week...
Not being able to pre-order it due to no release date kind of sucks though. Not as much as the botch of E3, but eh.