So we know that "Drivetrain 1.0" was really just a development drivetrain used in the prototypes and some of the first production cars with a planned retrofit to 1.5 ASAP. I think once Drivetrain 1.5 is finalized, they would probably just get rid of all the 1.0 components and relegate it to a footnote in the history books. The main way I think to describe 1.0 is 185kW, 640amps, 13,000RPM redline, 248hp max. 1.5 is currently slated for all production roadsters, and as far as I know there have not been any problems or delays so anything made in 2009 would likely have 1.5 and previously built cars would get retrofitted soon afterwards. I think I recall that they said they would let some early customers keep 1.0 (locked in 2nd gear) if they didn't care about the performance difference. Keeping an inventory of 2 different kinds of drivetrain components on hand probably isn't ideal, so I wonder if they would "insist" that everything someday get upgraded to 1.5? The specs for 1.5 don't seem to be 100% official yet. We heard stuff like "we have been able to boost the PEM output current by about 33% from 640A rms to 850A rms" and "The motor torque is improved by a bit more than 30 percent beyond what was already great and the ¼ mile time for the car is now in the 12.9 second range." and "The combination of less heat generation and the new gearbox is expected to improve the range of the car by about 10 miles" If we take the above and just add 30% to 1.0 specs we get something like 240kW, 850amps, 14,000RPM redline, 320hp max. Lately there have been some mumblings that 320hp may be too much. Perhaps the 30% torque boost isn't viable at higher RPMs and so max HP isn't so high. Anyways, time will tell. As far as I know, Drivetrain 2.0 is for Model S, and I recall they were possibly considering water cooling for the eMotor, and a single speed gearbox, but I don't know much else.