The Audi boys are actually in Sebring running tests on the new R15+ for the whole week. They did not participate in the 12 hour race due to the Pugs saying no to a planned interim R15.
Here is a quote from John Dagys:
Audi has been rooted in a political scuffle with arch rival Peugeot. Initially, Audi had asked for special dispensation to run an evolutionary model of its diesel-powered Audi R15 TDI after its 2009-spec prototype was deemed illegal by the ACO for this year. Approval had to be given by all LMP1 teams competing at Sebring, but Peugeot didn’t budge. In an ironic turn of events, Audi’s 2010-spec “R15 Plus” has been testing in Florida this weekend and will take part in a five-day test at Sebring after the 12-Hours, electing to still forgo the race despite having a fully 2010 ACO legal prototype. Peugeot will also be at the test on Monday and Tuesday.