To achieve the required emission reductions, fuel will need to be 50 - ppm sulfur at the least, although 10 - ppm sulfur fuel is recommended for better emission reduction performance. (transportpolicy.net)
As for the diesel, there's no telling what will happen, but I would expect an increase in horsepower and torque output to go with better emissions and economy as well. (topspeed.com)
When you add better emissions standards on cars and other businesses, it really adds up. (reddit.com)