My car had a definite rear end whine when I picked it up. At about the 300 mile mark on the way home it went away. I think it was the rear end (gears etc) breaking in a bit. If going about 65 and coasting and then just slightly depressing the accelerator to load the drivetrain you could hear the whine. Nothing obnoxious but it was there. Gone at about 300 mile mark.
