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I'm quite excited about 48v because it means turbos can now be driven with an electric motor until there is sufficient pressure from exhaust gases to spool them, and thus, mark the end of turbo lag as we know it!

The current model Audi SQ7 uses such a turbo-charger.

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I think that's https://en.wikipedia.org/wiki/Supercharger#Twincharging because they're investing engine power (via the alternator) as well as otherwise-wasted power from the exhaust.

Kinda. The difference between this and twincharging is that the supercharger is spooled by a belt driven by the crankshaft rather than an electric motor. This means that the rotational speed of the turbine (and therefore boost pressure) is proportionate to the current engine speed whereas a 48v electric motor can spool the turbo to 30,000RPM and provide full boost pressure at any engine speed.

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