So far, I've only seen overexcitment for a simple web-based viewer that displays very few data layers for a specific city and lacks a lot of useful information: for instance there are no POIs / streets labels / ... In this regard, I believe the recently unveiled WebGL-based Maps / Earth from Google are significantly more advanced. Most of the focus of your project has been on visual cuteness (tilt shift, animated cars) and wow effect (leap motion). This is combined with using buzzwords that IMHO don't really apply here (big data, platform). I'll be glad to be proven completely wrong when your beta is out.
Even when Google Maps came out, it was nevertheless showing useful mapping information and not only background data layers. In this respect, it was not a shiny toy.
My point is that the current prototype for ViziCities is focusing almost exclusively on visual appeal, at the expense of mapping accuracy / actual usefulness / advanced interactivity.