Same happened to me. I sent my email to Mileage Plus service center, don't know who is actually handling it (old CO OnePass or old UA Mileage Plus), but the new card did have a South Dakota return address, so that was the Mileage Plus Center before. Interestingly though, my card was posted from Frankfurt, Germany.

And why was this thread moved? This was about 2012 status (exp 2013) in the new Mileage Plus, should be in the new combined forum, no? Can't wait until the programs are combined on here, attempting to keep up with 3 quite active forums is a burden.