If it doesn't take you directly to the picture, its the one that shows the new GT world map( dealerships, used car dealerships, license ect.)
But on the bottom left you see a truck that says car delivery. My guess is that it delivers newly purchased cars to your garage, but my question is. What if you have to wait for the cars to get delivered to your house over a certian number of gran turismo days, like importing a car from japan in real life or something.
Cars gifted to and most likely random cars given while you play. That scree shot that shows the car delivery truck, at the very top of the screen is what looks like a ranking for A-Spec and B-Spec. My guess is that this is similar to Forza 3 in that ranking up is how you unlock more races that you can do. Ranking up also earns you free cars.