I was reading a thread in the Model S forum and it was a quite old so I wanted to start another because this does not really fit ideally. The conversation was about the awd option for the future model. There was a debate about what type of options should be explored for the new sedan. It seemed like in 09 it was going to be a lower power sub engine on the driven wheels to assist in traction control. I would be very skeptical of any details as they are still hiring engineers for this project and details available now would most likely be altered by production in some way. A standard 1 power unit connected by driveshafts to the four wheels. This is an ideal system in an ICE as there is only one path of rotation and a transmission device is required. That has suited us for the last century very well... lets think outside the box a little. Torque vectoring has been used by companies like Subaru and Nissan to regulate the amount of power that is sent to each axle or even individual wheels in some units depending on the system. As part of the new federal standards (http://www.fmcsa.dot.gov/rules-regulations/administration/fmcsr/fmcsrruletext.aspx?chunkkey=090163348008f2a4) traction control software is already required so it could easily be used adopted to control whatever systems is to be used. I was thinking the possibilities of single wheel motors (see the below video) into a Jeep or minivan in the future. Think about the space savings, it could really go either way. You could maximize the interior cabin volume or lift the vehicle for maximum ground clearance could lead to a myriad of options when it comes to potential. An electric H1 type vehicle comes to mind, maximum ground clearance with a modest center of gravity and few rotating parts. Using torque vectoring software coupled with four motors would create an all wheel drive system like nothing the world has seen. Instead applying the ABS in subsecond bursts, modulating the amount current being applied to the individual wheel would give the software engineers the ability to basically determine and control the feel of the car depending on the delay and timing of a power transition. Maybe I just dream big thought. Maybe an electric crossover is Teslas step 4 in global domination. If anyone will bring a suitable suv or crossover to market I am betting Tesla will have a pack leader before the pack gets the bugs worked out of their microcars. Working the bugs out of EVs will be what makes or break it as the next form of propulsion we use in our vehicles. I feel it is on us (well really you all, I'm just a jr member) as early adopters and enthusiasts to do our little part to bestow some knowledge on the public. As EVs are still almost considered in the sci-fi realm to some people who do not actively follow topics like this.