I'm buying a PS4 for this ;/ That's primarily because it's From Software, though; I'm trying not to find out too much about it so I can go into it relatively blind.
I wouldn't go expecting the atmosphere to be too different from Demon's/Dark Souls. They were bleak, dark, and oppressive, and that's pretty much FromSoft's thing. The biggest difference will likely be the setting - it's very gothic Victorian rather than bleak fantasy. It's still the same sort of thing, insofar as it's a civilization brought to its knees by a plague (of sorts), but it looks more European horror in its monster design. Werewolves, and so on.
Gameplay-wise, it does look very Souls: difficult, unforgiving, and reliant on timing and positioning. More aggressive, though, with countering based on attacking enemies rather than timing your block. I'm still expecting a lot of careful and desperate progression, though.
I could (and would, happily) post about why I like Souls and what I think that means for Bloodborne, but I suppose that's a bit of a different topic...