What about completely looking in another direction?
What if we also include the "Battleship of the future", which in this case is either the Large Aircraft Carrier, as well as the true submarine, rather than the more common Submergable vessels, requireing more time on the surface than below it.
Technically speaking, I suggest to include the USS Midway class, the Proposed British Gibraltar class and the never build Japanese Taiho-Kai type (last was a slightly enlarged Taiho.) Most of these were larger than the exising old big gun ships and had far more firepower and range.
Also the German Type XXI U-Boote is a capital ship of the future, as it was a true submarine, capable of spending more time below the surface and propelling itself faster submerged, than surfaced. It also had a seriously powerfull armament with automated reloading torpedotubes. Sicne a more classical battleship is an artillery orientated vessle, it is vulnerable to either air attack, or torpedo attack. All BB's no matter how designed, can be crippled, if not destroyed outright by a single torpedo, which is proven by the already mentioned lucky hit on HMS Prince of Wales (and to a lesser sense USS Pennsylvania), which both were finnished by a single torpedo, ending their carreer, or life. (USS Pennsylvania was lucky to be at anchor when struck in her stern, resulting in her being able to use nearby assistance to stay afloat, though her shafts had been deformed simmilarly, as in HMS Prince of Wales, meaning that when turning they would have torn appart the shafttunnels and caused massive flooding beyond capabilities to recover from it.)