Well, I can confirm that my car (with Tech Pkg) does NOT have fog lights. Either that, or they don't work. I was parked in front of a glass window today and did a little experiment. I turned on the low beam headlights and could see all of the lights were on, including the vertical accent light on the "fog light" assembly. I then tried turning the fog lights on and off -- nothing on either side. Odd that the button would be there on the touchscreen if there are no fog lights present (I wonder if the button is there on non-Tech Pkg cars?). I do know that the cornering lights are working, having seen them in action at night.
I have to admit I'm a little miffed. The car is already light on the options as it is, and Fog Lights were listed when I reserved. I'm not sure when they dropped off the options list, and whether they were there or not when I finalized. I would expect Tesla still has to make the assembly in order to repair vehicles that are collision damaged.