PowerPulse is a new technology from Volvo that will be available on the D5 engine on the new S90 and V90 and also the XC90 2017 model. The aim is to eliminate turbo lag by having the turbo working at full speed instantly. This makes the engine both more powerful and more responsive.
It works by having a storage tank of compressed air that is injected into the turbo when full acceleration is needed. Whilst the extra power is always good, the responsiveness is even more useful. The best bit is that this has little to no impact on fuel efficiency, a definite win/win.