The San Carlos, Calif.-based company will produce two basic types of its Whitestar sedan, due toward the end of 2009. One will run completely on batteries. The other will be a range-extended vehicle, or REV, CEO Ze'ev Drori said in an interview. In an REV, a small gas motor recharges the battery pack while the car is being driven. The battery pack on these types of cars only goes about 40 to 50 miles on a charge, but because it gets recharged while driving, the range of these cars will be longer.
They use this 'REV' acronym - and clearly they mean PHEV (Plug-In Hybrid EV). I don't know what REV could mean.
I found this audio clip on their web site - it's a "townhall meeting" aimed at the current owners of Tesla Roadsters. Well, none of them are owners yet, but incipient owners. The townhall meeting is going into some details on the Roadster design.