It seems unlikely that a lot of banks would set up shop around there. Some of the buildings are registered heritage properties and they're not well-suited to large commercial tenants. Hopefully this will result in a bit more mixing; maybe the old BMO building can be converted to another use like residential.
Here's the rendering:

Source
The Nova Centre will definitely make this feel like part of the downtown business district, whereas in the past it felt like downtown petered out a couple blocks below Brunswick. I always thought it was too bad that Halifax wasn't quite large enough that the old town site below the Citadel was fully developed with medium-sized brick and stone heritage buildings. That would have been a great "old town", with the modern office district to the west. The same could be said of the peninsula as a whole. It was mostly developed before WWII and before the era when most people had cars, but it wasn't so large that development was heavily constrained by the geography. That is only really happening now because traffic is becoming inconvenient. During the streetcar era and the early era of cars there was plenty of land and densities were fairly low.