Looks like a star trooper.

from the article:
It's a bit weird to see a racecar without a proper livery but nevertheless this second generation white Audi R8 LMS caught some attention this week at the Paul Ricard track during the official testing for the 2015 Blancpain Endurance Series. It will be built by quattro GmbH and is going to be available on order in the second half of this year.

11 pictures and full article