Thoughts about electric cars

I saw a new commercial for the 100% electric Nissan Leaf

http://www.nissanusa.com/leaf-electric-car/index?dcp=ppn.39666654.&dcc=0.216879047#/leaf-electric-car/index

I noticed the leaf doesn't have solar panels on the roof, yet.

I also noticed the new versions of the Toyota Prius does.

Where is this headed?