I don't know about this project, but OSM data included information on levels for a while (and it was used, in addition to just being there: e.g., in JOSM you can switch between levels for editing; not sure if I saw 3D rendering of OSM data before, but that's possible). While this looks like a demo by a commercial company selling "Interactive Map Solutions": not major news about OSM itself, but may be amusing to poke.