The Ford Field Service Engineer confirms the hum/vibration at speeds between 45 to 60 mph. He heard it before the service manager did when they drove it today. They also drove another Focus with the same options to confirm that other Foci don't hum or vibrate. He took some fluids from my vehicle and the other one to test. I'm guessing he just wanted to see if there were any metal fragments in my transmission fluid.
The FSE is going to bring his findings to a "Focus Group". The service manager doesn't know if that group is local or in Michigan. The FSE will get back in touch with the service manager, and will them know what needs to be done to get my car fixed.
On my way to pick the car back up again.