So with the 100km/h pitlanes now confined to 80km/h... pitlane drive-through losses will increase by 25%, though the stops will remain the same.
http://www.autosport.com/news/report.php/id/108908
In a 16-second pitlane drivethrough this means that the drive-through will lose 20-seconds now instead, and bias the "quicker strategy" options towards the less-stop strategies as the fresh-tyre benefit remains the same, but with more pit-lane time disadvantage. Those who can make their tyres last will gain a slight benefit from this.