While TSA has announced that AV is eligible to participate, AV has not made any announcement nor does its website have any information.
You are stuck calling AV or waiting until the counter and hoping that someone there has been trained and can then reprint your BP after entering your KTN.
A number of carriers have started their Pre-Check participation by requiring passengers to have their KTN added at the check-in counter, a nuisance which for many simply adds standing in one line to standing in another.