I really doubt Demon's Souls 2 is a thing, though those screens sure look Souls-y. Even if it isn't Demons 2, it sure looks like they're doing another game in the Souls mold, and if that's really the case, and it turns out to be as good as the previous 3 games, then shit, I might not be able to hold out on a PS4 any longer when it comes out.
As much as I love the Dark games (greatly prefer them actually, I think they're much better designed) Demon's Souls had an atmosphere all to itself. It felt much more like a horror game, though, that's not to say Dark Souls 1/2 couldn't be creepy in places. Perhaps it was just because I was younger when I first placed Demon's Souls.
That being said I'm worried that it won't differentiate itself enough. If they're going to do another Demon's Souls, I'd rather they give this its own distinctive flavour and gameplay changes.