Coil springs are replacing the torsion bars and it looks like struts instead of shocks. The only dissadvantage of coils is additional sprung weight. The advantages are that they are known for a smother more controlled easier to tune ride. They are definately a more advanced suspension system

Another upside is that they are easier to work with for lift kits since there are many more lift options available for coil overs.

Look for a much more involved aftermarket since now a company can make a product that can run across three or four different vehicles. For the first time it really makes financial sense to build parts for Nissans.