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Turbo lag was addressed by Ford at the intro in Texas. "The new turbocharger is 8.5 millimeters larger in diameter than before, which allows Ford to tune the Powerstroke to make more usable power, using less boost than before. That, in turn, meant Ford was able to eliminate the wastegate and its associated controls from the Powerstroke, making it simpler and more reliable.
Ford boasts that high-altitude performance is also improved, as is engine exhaust braking, thanks to the larger turbocharger. Other changes Ford made to the second-generation Powerstroke include a new high-pressure fuel pump and fuel injectors, reduced friction on the engine's internals, and a new torque converter for the six-speed automatic that allows it to handle the extra power."
they addressed the issue of turbo lag in the interview that said through a combination of the above and system management software, they believed that this would be a non-issue. I'm sure we'll find out when people get their hands on one!