...Anyway, I've watched some more extended gameplay videos of Bloodbourne. While it is missing the platforming, which is a key omission, it is bordering on a Metroidvania feel. The structure of the levels and the attention to detail/atmosphere look excellent; it also feels more organic and interactive than what I played on LoS, and what I saw from LoS2. Plus, I really like that it feels more player/skill-based, where there aren't huge chain combos.
Platforming, enemy placement, and music are the biggest things missing from showing itself to be a good fill-in for a classic-styled 3D Castlevania. It does look to be more Castlevania than the Dark Souls stuff was, both in art style and pace, though. Still, in the end, it's not a proven one-to-one replacement for Castlevania in 3D by any means. I would take a look at it, however, if I were a developer thinking about Castlevania in 3D. Not as an overall template, but as a visual/structural reference for 3D space.