Well, considering this new animation.
I think it would be a great opportunity to reintroduce the series to the big public.
I personally, of course would love a Metroidvania.
But honestly, it could be styled in anyway at this point.
Maybe similar to the N64 games, but with better gameplay.
Some improvement over the usual Metroidvania is what I would love.
And considering the Switch has a large amount of Metroidvanias, I think it might be a possibility.
A Rondo of Blood style of gameplay with different paths would be good too.
Or maybe something completely new.
Maybe explore upon the Simon's Quest formula a little more, but improving it.
Having towns and the world all connected was really nice, I could imagine that happening nowadays too.
And maybe could have the Castle itself be in Metroidvania style. Basically being the last stage, it would be really nice.
Since games nowadays are longer, I'm imagining a 2D Castlevania, mixing various aspects of the series through all the years.
Or something similar.
But of course, I'm just daydreaming about possibilities.
We don't even know if they will even do anything.