Thanks PHL!
I called the CP line about 4 more times to see if one of them would try to get 2 seats to open. No go.
Two of the phone agents suggested purchasing the upgrade fare now and when (if?) seats open, I would be able to use miles for the upgrade. Of course, paying an extra $350 pp doesn't guarantee an upgrade.
Tried using the online chat (questioned about preferred instant upgrade) and told there were no instant upgrades for transatlantic. I then asked about upgrade with miles and her response was:
"There is not a number to call. (I had asked about calling someone) Upgrade seats would only become available by someone already holding an upgraded seat, canceling or changing their reservation. It is just a matter of checking back occasionally."
Now, I don't know what to do. Last November I had made the same type of upgrade reservation for this April and had no problem getting the reservation. This is in line with what an agent told me - probably in November.