EDIT: I lied about the elctrical assisted turbo's. I was thinking of variable ones.

here from Popular Mechanic's site Garrett has developed some already and a lot of semi trucks are already using them.

Garrett has also developed an electrically assisted turbocharger that doesn't rely solely on exhaust gas flow energy. At low engine speeds, an electronically controlled electric motor responds to engine load and boosts the turbo up to high-pressure speeds. At high engine speeds that produce enough exhaust flow to spin the turbo's turbine, the overrunning motor can be used as a supplementary generator for the vehicle's electrical system.

Electronics will eventually take over where vacuum controls leave off. Garrett produces different types of turbos that adjust themselves depending on the load of the engine. This helps to reduce the dreaded "turbo lag," that second or so between when you dip into the accelerator pedal and you actually feel the engine pull harder. By sensing engine load and controlling the turbo with fast, sophisticated sensors and actuators rather than engine vacuum, turbo lag will eventually become just a footnote in engineering text.