IT'S NOT A TUMOR A-WING. MaarekStele brought this to our attention in the forums. I said that the ship seen approaching a new planet in the Rise of Skywalker trailer might be an A-Wing. I specifically said "might" because I really couldn't tell from the brief shot. The placement of the engines and the flat shape were reminiscent of an A-Wing, but it seemed too flat. My better nerds on the internet may have solved this puzzle. It definitely looks like the mystery vehicle is the shuttle seen fleeing Jakku after Rey was abandoned during the flashback scene in The Force Awakens. Judge for yourself.
(click for the full sized image)
Brightness enhanced screen grab from the Rise of Skywalker trailer.
(click for the full sized image)
Screen grab from The Force Awakens flash back scene,