I'm not convinced that this ultra-modern eyesore in the city is indicative of a new "Future Era" city set:
It's just a single structure. Given that there's no more room in the Government Plaza, I wonder if the City Centre will play host to the new Tier 4 government buildings? I remember that it was leaked that the Tier 4 governments will have these absurdly hipster-esque names like "Digital Democracy", and a neo-futuristic skyscraper with neon lighting sounds about right for that.
Well the government buildings are one per civ, not city, so having it built in the city center wouldn't make as much sense. And it seems not that difficult to rescale the government plaza buildings to fit another.
It certainly could be some sort of new city center building though. With the advent of railroads, some sort of train station or general 'transport center' would make the most sense for a city center, but that doesn't really resemble one at all.