There are going to be two user-programmable toggle buttons below the pilot screen alongside the temp and fan controls. I'm hoping one of them can be programmed to switch drive modes without going into a menu (including dispensing with that annoying "Confirm" button for Sprint mode).
Although Homellink in the Air can be programmed for up to 16 doors & gates (for owners with multiple homes) I, too, hope at least two or three can be programmed into direct-access buttons, ideally on the bottom of the rearview mirror where they don't clutter up anything but are easy to reach.
Also, a question for those who have seen the show car in person with the Yosemite interior: does the Yosemite look like a fabric or a synthetic leather?