Chris Hu on 05 June 2017
Not sure about Gran Turismo 1 and 3 since they have smaller car rosters but I'm pretty sure both 2 and 4 and probably also 5 and 6 have a lot of cars where they no longer have the license for some of the cars so that is why them republishing them is highly unlikely. Expired car licenses is also why you will probably never see Forza Motorsports 1, 2, 3 and 4 added to the X1 backwards compatibility list. The first Horizon game was barely added in time since the license on all the DLC cars ended shortly after it was added to the backwards compatibility and the license on some of the cars in the main game also expired that is why you no longer can buy it digitally also.
