Most likely. But even for that initial launch, I'd be surprised if the Void didn't bleed elsewhere.
In terms of being traversable, no. It would be partly skybox or set dressing. But there's still a lot on the table stylistically to go through that they didn't and so many enemy variations that have been Old God aligned that they crammed into such a small space.And I have to ask, non-Euclidean geometry is awesome when you are doing artwork or even in a TTRPG but has any game really managed to do it justice in an interactive 3D environment?