I was specifically referring to the gameplay. The base premise of parry-based combat has been received quite well and has been adopted into many soulslikes after it like Khazan, Lies of P or even that one class in Nightreign. It's perfect the way it is, I feel like, but Khazan showed that it can be expanded upon. I'd not be surprised if From cooked something up that builds off the very good base.

Apart from that, similarly to Bloodborne, the world allows for more story to be told. Be it a prequel or a follow-up to the true ending - there's potential there. Since the game is relatively grounded in reality and Japanese history, you could argue there's less to expand into compared to the Eldritch horrors of Bloodborne, but there's probably more. Not an expert though, can't articulate what exactly I'd like to see outside the two possibilities I've outlined further up