The design of that demo looked fantastic but I could imagine that they had to cut some costs. when making the real deal. That said, the system we see there looks a bit weird. My knowladge on Astrophysics is pretty limited but if I am informed correctly, planet's orbits around a star are usually aligned pretty much in a plane because of the balance between centripetal and gravitational forces. So tat 3d system there would probably be fairly unusual. Still, it looks great and I am not sure about things like extra-solar captures and such oddities, that could defy the norm.
In any case, I do hope they 'll have the planets look like in that video, rather then the plastic ball looks that we had in ME2/3.