1111GS

I'm not a car guy but I think your experience is due to a combination of the following:
1. New 8 gear. I too feel it doesn't roar as much compared to my old Luxury
2. Driver's side door is improved. It closes a lot softer. This in turn may provide extra isolation.
3. They might have changed the intake. Who knows?
4. You should consider a new set of tires if you feel too much road noise. Dunlops/Bridgstones are not that great. I know new Michellins are expensive but they are worth it. i feel that the 19 Michellins PSS are as quiet and smooth or more than the old 18 Dunlops.

peteharvey

I know 2015 got new windscreen adhesive for greater torsional rigidity and bending stiffness.
2015 also got a stronger A pillar.

I've tried green silicone impregnated tires before, and they have very low rolling resistance, and outstandingly quiet, however I find the ride poor.
Bridgestone Serenity Plus are green silicone impregnated with low rolling resistance, lighter power steering, super quiet, but a very lumpy ride.

Are the Michelin PSS green silicone impregnated low resistance super quiet tires?
If so, I'm worried the ride may be firmer and too lumpy?

Afrosheen

You only hear it at WOT. Otherwise it just quietly does its business without drama. If it's too loud turn on the radio.