Personally, I feel that a Castlevania reimagining should expand upon the framework of the original Devil May Cry by Hideki Kamiya, I love the other games, but I feel DMC1 was a near-perfect translation of CV to 3D since publications back in 2001 compared it favourable to CV and the actual 3D CVs borrowed from it. Of course, firearms and the style system can be omitted in favour of subweapons and an MP system that rewards good combat. As for aesthetic, I very much like the SotN to Curse of Darkness era as well as Order of Ecclesia returning the art to IGAvania's gothic roots after the weird shift in Dawn of Sorrow and Portrait of Ruin.
My only concern is what a reimagining might do to the fanbase since Lords of Shadow and DmC: Devil May Cry created a whirlpool of negativity and shitposting back in 2010, as in we had a bunch of insecure losers trying their darnedest to look macho on the internet by bashing the story and aesthetics of the original series. Hell, if those same users were around now, they'd be using tired buzzwords like "cringe" or "soy" to describe the original series. And don't get me started on how one particular Netflix reimagining of a popular Castlevania character made crazy Classicvania purists (I love Classicvania, by the way) act like the same insecure wannabe jocks they were back in 1997, but this time with a smug, unwarranted "I told you so" attitude despite the story not being connected to the classic universe whatsoever.
I personally loved the Lords of Shadow trilogy, but being honest, the dumbest argument for them I saw was that it was a return to form despite it being very much a reflection of modern gaming trends a la God of War and cinematic storytelling.
Though it's supposedly being handled in-house, so the biggest change we could see is the new game resembling Bloodborne to some degree. I think Konami might've learned from Capcom how outsourcing to the west is a terrible idea, that and Netflixvania just isn't popular in Japan. I'm quite averse fo western outsourcing since more often than not, way too much is lost in translation and culture.