The frame on display in their showroom seems to have two motors in the back, except one of them acts as a generator (for regenerative braking). Maybe they changed the power routing to let it drive as well? Sounds like too small a change for such a fancy rollout.
There is one motor. The other large cylinder (that does look just like the motor) is the inverter: it turns the DC from the batteries into AC for the motor.
My reasoning: Tesla has vehicles (for sale or in plan) in three segments: high-end sedan, CUV, and mid-range sedan. Building a coupe would fill another segment.
Also, the 2-door market has lots of models (2/4/6 series, C/E/S class, A5, CTS) that are priced high. Attracting higher income buyers to Tesla from these companies with a 2-door would be a very logical next step.
Can't find a reference to it right now; but, I recall them saying back post-Q1 or Q2 that they had delayed production due to higher than expected demand for the Model S.
what about a Hybrid? Diesel and Battery! I would love to see the Model X be a hybrid instead of pure EV, or at least an option for those of us who need to pull trailers and boats on occasion with our SUV.