You can sometimes find a School Bus Yellow as a leftover cargo or passenger van when a dealer orders more vans to help out the fleet customer and ends up with one or two not taken. They can have some odd options and a lot of them tend to have the Pewter Vinyl seats.
I'm disappointed that Ford deleted the stone gray color for 2020. I think that would have been my choice. It looked a little more brown that gray. The diffused silver might have potential, but it's hard to tell from the small sample photos.
Just click on the color you want to view and it brings it up in a larger block for you to see. They have combined BOTH the Transit Connect with the larger Ford Transit so it may confuse you seeing other colors that are not available on the larger Ford Transit.
Ford may continue the online site where you can click on a color chart and it will display the color on a large image of the Ford Transit on a cargo van or passenger van.
The current setup is just showing a Oxford White or Agate Black.