Given that in built form it isn't/won't be easily differentiated from either Queen's Quay or the Financial District, I don't think it makes sense for it to even have its own name... it's a tiny area, really, centered on Bremner and York. It's just downtown, or the Financial District or "by the ACC" to most people. I don't think it really needs its own informal name. Planners and articles may refer to it as Southcore, but I don't think most people will ever call it that. It's just a small area that blends into numerous existing areas around it... Queen's Quay, Financial District, Entertainment District, Union Station, etc.