Actually that transcript did clear some things up.
The main source of confusion is that there are two different development paths both being called "2.0". That web site saying that the "Roadster Sport" and "Model S" will have the same drivetrain probably jumped to the wrong conclusion because they heard that the Roadster Sport will have a "2.0" drivetrain, and also heard that model S will have a "2.0" drivetrain, but it is two different "2.0s".
Now I am going to pick apart another confusing statement:
And a lot of the true next generation stuff is actually in the Daimler pack that we're developing there for the Smart. The motor and power electronics will be liquid cooled vs air cooled, which gives a higher continuous power rating.
When he says "higher continuous power rating" I do
NOT take that to mean that the SMARTe motor will make more power than the Roadster powertrain, what I read into it now is that the "true 2.0" (liquid cooled eMotor) technology from the Model S program will make it into the SMARTe drivetrain program, and the (almost certainly smaller) SMARTe motor won't suffer from the same level of top speed fallback seen on the air cooled Roadster. In other words, the "true 2.0" water cooled motors will be able to substain closer to the peak rated power outputs for longer periods of time... But that is relative to that particular motor, not to the entire line of future Tesla motors. (Hopefully you are following me so far). In other words we know the current Roadster can't hold its' top speed for long periods of time. It may automatically back off from ~125MPH down to ~105MPH because the eMotor can start to overheat. For Tesla SMARTe it may have some lower limit (say 90MPH as a guesstimate, but it will be able to maintain that top speed and not have to fallback much if you try to hold top speed). For this reason the upcoming "Roadster Sport" is still not fully optimized as an autobahn or track car. It may still have to cut back on substained top speed. They are going to try to rectify that situation in Model S and SMARTe by switching to "true 2.0" water cooled eMotor.
Now back to 2009 Roadsters. Personally I am going to avoid calling any 2009s as "2.0 drivetrain". There will be efficiency/performance improvements in the "Sport" model, and perhaps some cost reduction technology in the base models, but it is still likely just minor/incremental compared to the "true 2.0" tech coming later in Model S and SMARTe.
Futher confusing things are plans to eventually put the "true 2.0" technology in some future version of the Roadster (say in 2-3 years), and make it a better autobahn/track car, but that is too far off to think about too much now.
For now I think we should probably just call the 2009s "1.5+" and sort out exactly what "+" means later.