My tracking number works. It's UPS and 18 digits/characters. Although it says in the email "USA: Next Day via UPS," UPS shows it coming from Sheffield. It was my understanding that Sheffield only approved the visas and NYC sent them out but this could have changed along with everything else. It's leaving Sheffield today, per UPS, Tuesday (26 Feb 2013) and is due to arrive here, in Chicago, on Thursday (28 Feb 2013).
My friends and colleagues are very supportive, but until someone goes through this process they have no idea how stressful it is. It's time for a drink! ;O)