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This is something many oems are working on. Everyone wants turbos as they allow you to capture waste heat from the exhaust. However lag has always been the problem here.
IIRC BMW's system uses an electric motor to spool the turbo until there is enough exhaust gas flow to power the turbine. This is going to be a good stopgap measure until thermo-electric generators become cheaper and more efficient. If we could capture even half of the heat which is current wasted out the exhaust and radiator we could double fuel economy.
Lots of people want to think the ICE is dead but the truth is we have a long way to go before that happens.
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