UCS U-Wing Fighter
One of my dreamed LEGO sets would be an UCS U-Wing fighter, as it is one of the best designed ships from the new films era. It would follow the characteristics of the UCS Millenium Falcon, or the UCS Slave I: minifigure scale, high atention to detail and interior space to work with the minifigures (cockpick with two seats, space behind it with the bench to sit more passengers, maybe one turret, sliding doors on both sides). As It would be quite big I estimate around 3000 to 4000 pieces, I think the best way to display it would be on its own landing gear, but It could also come with a stand just as with the UCS Lambda Shuttle. The wings should be able to fold as seen in the film.
For the minifigure selection, I think that the obvious choice is to go with the full Rogue One Squad: Cassian Andor, Jyn Erso, K-2SO, Bodhi Rook, Chirrut Imwe and Baze Malbus. But taking into account that this is a UCS model, and a very special one (I don't see LEGO remaking this set after ten years or so, It is not as an iconic ship as others) I would throw, at least, one exclusive minifigure that should be Saw Guerrera.
With the release in 2022 of the Cassian Andor's series, maybe is the perfect moment to release this UCS set, If I had to bet, I would surely say that the U-Wing Fighter is going to be featured very prominently in the show.