Do you already wonder how the next OpenScienceMap will look like? Navigate to http://opensciencemap.org/map/ and check some of the new features!
Click right with your mouse to rotate and tilt the map. Zoom in and out to see 3D buildings, POIs, etc. However, some features like interactive route- and POI layers are not yet ported. OpenScienceMap is still primarily a mobile map.
Some screenshots from Bremen: