Do you think that Tesla Motors will engineer these in-wheel motors for one of their future models? It might lead to more range using the same battery pack.
Have a look at their website: proteanelectric.com
It could be adventageous in some ways, but increasing the unsprung weight (weight that is not supported by the suspension, like wheels and tires for example) negatively affects ride quality.
Already discussed at http://www.teslamotors.com/forum/forums/why-not-inwheel-hub-engines