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My impression is that it would be a serial hybrid; and we'll see how efficient it is. I think they can be more efficient because the ICE can be smaller (since it only has to meet average demand), and it can be tuned to run at a fixed RPM and therefore it always runs at peak efficiency. A smaller engine warms up faster, and requires less cooling, so the cooling intake can be closed when it is not needed; lowering drag. A serial hybrid has no multi-gear transmission.
Whenever you have to move the car with the ICE, it has to be larger (to meet peak demand) and it often is running off peak efficiency, and it idles some of the time; unless you also implement stop/start.
So, we'll see what it is as soon as they tell us!
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