Given how much of a big deal Cazador is, according to Astarion, we will definitely be paying him a visit. But I doubt that we would be able to crash at his place after killing him: it's probably uninhabitable for anyone who isn't undead. So, it'll probably be a trip around the vampire manor with the final boss fight.
However, I do believe that the camp's design will change depending on the location. We may even get a temporary base of operations somewhere in the Baldur's Gate instead of squatting with our bedrolls, but I don't think it would be a castle or a fortress. Given how the plot is going, it may be something of a hideout, with crafting stations and everyone's private corners available.
