In the past (e.g. iPhone 5) AT&T used both FedEx and UPS. FedEx shipping info. showed up on Wednesday.
Just saying that for those who have "Preparing to ship" status today and nothing showing up on UPS MyChoice may be getting theirs FedEx with shipping info. showing up tomorrow (Wednesday).
Possibly. I have one package on UPS my choice (1.2 lbs) but nothing else yet. How strange would it be if one come FedEx and one UPS?