I'll let you know the outcome ASAP. Honestly I thought they were trying to keep me from complaining further about the USB/bluetooth issue, but they are allegedly taking care of that. I'll keep you posted. I cannot see them installing a mirror on yours that doesn't match the other side.
I just got back from the dealership on this mirror TSB. They only ordered a replacement DRIVER's side mirror. They told me that they should be cosmetically the same as the original. I tried to protest, show pictures, etc - but they wouldn't budge. At this point, I think my best bet is to just wait for the replacement mirror to show up, and if it's cosmetically different, to say "I told you so" and make them call Mazda for guidance.
They were nice enough to let me read the TSB (but not let me take it out), and it doesn't say to replace BOTH mirrors. In fact, the part list for the TSB _only_ shows the driver side mirror assembly. We'll see...
Take care
Gary