Last week we were in Northern California to drive the XC90 2.5T and T6 models. Read more about it on our main page or in our XC90 section also linked on the main page.
They had tobring them in with Swedish plates as these cars have not been EPA and crash-certified, yet. So, a foreign manufacturer is allowed to bring in a certain number of pre-production units "for demonstration and weather testing" only and only for a period not to exceed 12 months. That is the only way these cars can clear customs. As a result, they will have to bear plates of the country of origin.