I've been following the new car quite closely, and have the following observations:
-The initial ride wasn't great in either; the air sprung was too soft, the transverse leaf too harsh; they have changed the suspension settings a little bit after the first ones (*as with any car wait 12months to get one... allows the glitches to be someone else's problems!)
-There have been software updates on a few bits and pieces (I want to say some of the control software for the dash)
Autocar in the UK have
tested one, and have run one to 18,000miles and
autocar.co.uk/car-news/our-cars/volvo-xc90-long-term-test-review-being-mindful-mileage are now onto their second as a long term test car.